题目内容

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

D


解析:

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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