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I think he's been drinking, _______ I'm not completely sure.

A.if B.though C.because D.while

B

解析试题分析:句意:我认为他一直在喝酒,虽然我不完全确定。If如果;though尽管,虽然;because因为;while在……期间。根据题意选B。
考点:考查连词。

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