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--- 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．whenB．whyC．thatD．how
B

試題分析：Mike放棄了最心儀的耶魯大學，令人不解其故。A項表“時間”，D項表“方式”，均不合題意。have no idea =" not" know，后面的從句應該表示“疑問”，排除表“確定事實”的C項。故本題選擇B項。why表示“原因”。
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