It is/was+被强调部分+that+句子的其他部分。故答案为B。

【点评】考查强调句型。

39．It was as a result of his carelessness _______ a serious fire broke out during the night.

A. when

B. that

C. before

D. since

【答案】 B

【解析】【分析】句意：那晚突发大火是他疏忽的结果。通过分析句子成分可知，It is...that...是强调句式，其中as a result of his carelessness在句中作原因状语，主句是a serious fire broke out during the night ，符合强调句结构。故选B。

【点评】考查强调句式，掌握其结构“It is...that...”。

40．It was the hard work and determination of the generation had changed the opinion of people towards Chinese.

A. why

B. that

C. when

D. which

【答案】 B

【解析】【分析】句意：正是这一代人的努力和决心改变了人们对中国人的观点。本题考查的是强调句型，强调的是句子的主语the hard work and determination of the generation；强调句型的基本结构为It is/was+被强调成分+that/who+其它成分；其最大的特点就是去掉it is/was…that/who…句子仍然成立。但要注意强调句型能强调除谓语动词以外的所有的句子成分。分析句子可知，本句中去掉强调句型的结构后句子完整。故第二个空是that，故选C。

【点评】考查强调句型，掌握其结构It is/was+被强调成分+that/who+其它成分。

41．It was years later, with years of training behind her, ________ Yang Yang won the first gold medal in the 2002 winter Olympics.

A. as

B. which

C. when

D. that

【答案】D

【解析】【分析】考查强调句型。句意：几年后经过多年的训练，杨洋赢得了2002年冬季奥运会的第一枚金牌。with years of training behind her为独立主格结构，把it was 去掉后，该句为一个完整的句子，所以可以判断该句为强调句，强调句的结构为it is/was……that/who……，故答案选D。

【点评】考查强调句型。

42．I wonder ________ that brought the Olympics back to life.

A. who it was

B. who was it

C. it was who

D. was it who

【答案】 A

【解析】【分析】句意：我想知道是谁把奥运会复活了。这是一个强调句型，强调主语的特殊疑问句在宾语从句中的使用，注意语序应为陈述语序，故选A。