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

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

B

解析試題分析:句意:我認(rèn)為他一直在喝酒,雖然我不完全確定。If如果;though盡管,雖然;because因為;while在……期間。根據(jù)題意選B。
考點:考查連詞。

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