题目内容
Mr. Green didn’t understand ________ made his daughter so absent-minded this morning.
| A.how that was | B.what was it |
| C.why it was that | D.what it was that |
D
考查强调句的疑问形式。根据题意可知,宾语从句中缺少主语,故用what引导其强调句,选D。
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