1、ock the fire broke out，句子不完整，但若在five oclock前加上介词at则可以，因为 at five oclock 用作时间状语。此题选A可分析为：it 表时间，when the fire broke out 为时间状语从句，全句意为“火灾是5点钟发生的吗?”比较下面一题（答案选B，为强调句）：Was it at five oclock _the fire broke out?A. when B. thatC. which D. in which8. “Was it under the tree _ you were away talking to a friend
2、?” “Sure. But when I got back there, the bike was gone.A. that B. whereC. which D. while【迷惑】此题很容易误选A，认为这是强调句型。【分析】其实此题应选D。做好此题的关键是正确理解上下文的语境。在此句中，it 是代词，指代 the bike，句意为：“当你离开去同朋友谈话的时候，你的自行车是在这树下吗?”“当然，但当我回来时，自行车就不见了。”现在反过来分析一下，假若选A，将此句判为强调句，句子即为 Was it under the tree that you were away talking to a
3、friend? 若进一步转换为非强调句，句子则为 Under the tree while you were talking to a friend，句意显然很荒唐。9. Its more than half a century _ my grandfather joined the Party and became a servant to the people.A. when B. thatC. since D. while【迷惑】容易误选B，认为这是强调句型。【分析】假若选B，将此句分析为强调句，那么若将此句还原为非强调句就应该是My grandfather joined the Par
4、ty and became a servant to the people more than half a century. 很显然, 句中的 more than half a century 是一段时间，然而它修饰的谓语动词 joinedbecame 却是两个终止性动词，这显然不合适。其实，此题应选C，属于“It is一段时间since 从句”句型，句意为“我爷爷加入党组织成为人民的公仆已有半个多世纪了”。此句的主句谓语也可以用现在完成时态(has been)，但在口语中多用一般现在时代替。10. It was lack of money, not of effort, _ defeate
5、d their plan.A. which B. asC. that D. what【迷惑】容易误选A，受空格前逗号的影响，误认为这是一个非限制性定语从句，从而误选了A。【分析】其实，此题最佳答案为C，整个句子为强调句，被强调成分为 lack of money, not of effort。由于句中插入 not of effort 这一结构，干扰了许多同学对 it was lack of money that defeated their plan 这一强调句的认识和理解。 精编迷惑题训练1.Who are making so much noise in the garden?_ the ch
6、ildren.A. It is B. They areC. That is D. There are2. It is _ he often fails in exams _ makes his parents worried about him.A. what; that B. that; whatC. that; that D. / ; that3. It is the protection for the trees _ really matters, rather than how many trees are planted.A. what B. thatC. 不填 D. which4
7、. It is _ my father worked _ I work now.A. where, that B. where, whenC. that, where D. that, that5. Was _ that I saw last night at the concert?A. it you B. not youC. you D. that you6. It was ten oclock _ he came back home.A. when B. thatC. since D. after7. It was not until he came back _ he knew the
8、 police were looking for him.A. which B. sinceC. that D. before 【答案与解析】1. 选A。为强调句型 It is the children who are making so much noise 之省略。2. 选C。为强调句型，被强调成分为主语从句 that he often fails in exams。3. 选B。为强调句型，句意为“真正重要的在于保护树，而不在于种多少树”。4. 选A，整个句子为 it was that 格式的强调句式，即第二空要填that；第一空填where，where my father worked
9、为地点状语从句，为强调句的被强调部分。句意为“我现在我父亲曾经工作过的地方工作”。5. 选A，为强调句的一般疑问句形式，其相应陈述句为 It was you that I saw 。6. 选A。when 表示“当的时候”，句首的 it 表示时间，全句意为“当他回到家时，时间是10点钟。”7. 选C。为 He didnt know the police were looking for him until he came back 之强调形式。注意，not until 的强调句式通常为 It was not until that It is/was+.who/that强调句型使用频率很高,高考也
10、很注重对它的考查,然而该句型结构复杂,变化多样,在实际使用过程中颇有难度。笔者认为使用强调句型时应注意下列十要素(本文前五个要素合并举例说明,后五个要素分别举例说明)一、如果强调句型指现在或未来情况用It is,指过去情况用It was。二、被强调部分往往是句子的主语、宾语、时间状语和地点状语,但有时也可强调比较复杂的内容,如时间状语从句、条件状语从句、not until.、not only.but also.、.as well as.等结构。三、被强调部分是人称代词时,原句用什么格,强调句也用什么格。四、被强调部分如果是主格人称代词时,who/that后的动词应和该主格人称代词在人称和数上保
11、持一致。五、关于强调词的选用,强调人时可用who或that；如果不强调人一律用that。此时绝不能和定语从句混淆,被强调部分为时间状语、地点状语或者原因状语时不能误用when、where或why。例1：It was him who/that I saw the day before yesterday.析：该句原句为：I saw him the day before yesterday.该句指过去情况,所以强调句型应使用It was开头；被强调部分为原句宾语-宾格人称代词him,所以强调句型仍用him作被强调部分；被强调部分指人,所以用who或that。例2：It was in the street that I met him yesterday.析：该句原句为：I met him in the street yesterday.该句仍指过去情况,所以强调句型仍以It was开头,被强调部分虽为地点状语,但不能用where,只能用that。例3：It was because he was s
