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【题目】_______ he can't answer the question, you'd better ask someone else.

A. Before B. So C. Since D. until

【答案】C

【解析】

句意“因为他不能回答这个问题,所以你最好问其他人”。A.在……之前(引导时间状语从句);B.所以;C.因为(引导原因状语从句);D.直到(引导时间状语从句)。根据句意可知,译为“因为”,故选C。

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