【題目】_______ 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“因為他不能回答這個問題，所以你最好問其他人”。A.在……之前（引導(dǎo)時間狀語從句）；B.所以；C.因為（引導(dǎo)原因狀語從句）；D.直到（引導(dǎo)時間狀語從句）。根據(jù)句意可知，譯為“因為”，故選C。

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