【点评】考查强调句型，本题涉及，强调主语的特殊疑问句在宾语从句中的使用。

43．It is water, which seems so simple and common, ________ makes it possible for all living beings on this planet to survive and develop.

A. when

B. which

C. that

D. where

【答案】C

【解析】【分析】句意：是看起来很简单很普通的水使地球上所有的生物都有可能生存和发展。这是一个强调句型，其结构：It is/was+被强调部分+that/who+句子其它部分，故选C。

【点评】考查强调句型，掌握其结构：It is/was+被强调部分+that/who+句子其它部分。

44．It was back home after the experiment.

A. not until midnight did he go

B. until midnight that he didn't go

C. not until midnight that he went

D. until midnight when he didn't go

【答案】C

【解析】【分析】句意：直到半夜实验后他才回家。not until的强调句必须写成it was/is not until +陈述语序。所以选C。

【点评】考查强调句，本题涉及not until的强调句型。

45．It was only __________he reached school ___________he realized that it was Sunday.

A. when; did

B. when; that

C. that; when

D. that; which

【答案】 B

【解析】【分析】句意：只有当他到达学校的时候，他才意识到那是星期天。强调句的结构：it was／is+被强调部分+that+其他。本题中强调的是时间状语从句，由when引导。故答案为B。

【点评】考查时间状语从句和强调句式，掌握强调句型的结构。

46．Do you have any idea computer plays so important a part in our daily life?

A. how is it that

B. what is it that

C. how it is that

D. what it is that

【答案】 C

【解析】【分析】考查名词性从句和强调句式。句意：你知道电脑怎样在我们的日常生活中扮演如此重要的角色吗？idea后面是how引导的同位语从句，并且对how进行强调，故答案为C。

【点评】注意名词性从句that和what引导词的不同，以及强调句的疑问句句式。

47．________ you picked up the watch?

A. Where it was that

B. Where was it that

C. Where was it there

D. It was where that 【答案】 B

【解析】【分析】句意：你是在哪里捡到这块表的？把句子改为陈述句It was where that