问题 选择题

Mr. Mike doesn’t understand ________ made his wife so upset this morning.

A.what was it

B.why it was that

C.how that was

D.what it was that

答案

D

understand 后面是一个宾语从句,从句中缺主语,同时又是强调结构的疑问形式用在宾语从句中。

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