It was because I was ill I didn’t go to school.A. whyB. thatC. whichD. when

问题补充：

It was because I was ill I didn’t go to school.

A. why

B. that

C. which

D. when

答案：

A. why

(答案→)B. that

C. which

D. when

解析：

时态分析：考查强调句型。强调句型：It is/was被强调成分that/who其它成分；强调句型最大的特点就是把it is/was…that/who去掉，句子仍然成立。本题强调的是because I was ill.句意：正是因为我病了，我才没有去学校。故B正确。