1、It was not until the accident happened ______.

　　A. when I became aware of my foolishness

　　B. when my foolishness became obvious

　　C. that did I realize my own folly

　　D. that I became aware of my own foolishness

　　2、It was not she ______ was appointed.

　　A. of whom　　B. whom　　C. for that　　D. that

　　3、It is because she is too inexperienced ______ she does not know how to deal with the embarrassing situation.

　　A. so　　B. so that　　C. that　　D. that is why

　　4、It was the training that he had as a young man ______ made him such a good engineer.

　　A. that　　B. so that　　C. so　　D. which

　　5、It is during his spare time ______ John has been studying French.

　　A. when　　B. that　　C. which　　D. what

　　参考答案&解析：

　　1、D　这是一句强调句。原句为：I did not become aware of my own foolishness until the accident happened. 此句强调状语。再如：It was when he fell into the pit that he knew it was deep.

　　2、D　本句强调主语，关系词也可用who。如：It is his mother that(who)has done everything for him.

　　3、C　本句强调状语从句。再如：It was because they not fulfilled the task that they were criticized.

　　4、A　强调主语，句中夹有一个定语从句，如：It was the setback that he had had that made him sorrowful.

　　5、　本句强调时间状语。也可写成非强调句：John has been studying French during his spare time.