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【题目】—Is it true that Mike refused an offer from Yale University yesterday?
— Yeah, but I have no idea _______ he did it; that's one of his favorite universities.
A.when
B.why
C.that
D.how

【答案】B
【解析】句意:——Mike拒绝了耶鲁大学的帮助,是真的吗?——哦,但是我不知道他为什么这么做,那是他最喜欢的一所大学。have no idea = not know,后面的从句应该表示“疑问”,排除表“确定事实”的C项。故本题选择B项。why表示“原因”。

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