--- 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(xué)，令人不解其故。A項(xiàng)表“時(shí)間”，D項(xiàng)表“方式”，均不合題意。have no idea =" not" know，后面的從句應(yīng)該表示“疑問(wèn)”，排除表“確定事實(shí)”的C項(xiàng)。故本題選擇B項(xiàng)。why表示“原因”。
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