【題目】There is no difference between the two words. I really don't know________.

A. what to choose B. which to choose C. to choose which D. to choose what

【答案】B

【解析】know, expect, decide等動詞后面可以接疑問詞加to do不定式結構，句子意思為“不知道該選擇哪一個”。故選B

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