题目内容

I think he's been drinking, _______ I'm not completely sure.
A．ifB．thoughC．becauseD．while
B

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。
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