题目内容

—May I go swimming this afternoon?
— I'm afraid not _______ you have finished your homework.
A．ifB．unless C．becauseD．but
B

试题分析：句意：今天下午我可以去游泳吗？如果你没有完成作业恐怕不行。A. if如果 B. unless如果不C. because因为D. but但是，根据句意，故选B。
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