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

試題分析：句意：今天下午我可以去游泳嗎？如果你沒有完成作業(yè)恐怕不行。A. if如果 B. unless如果不C. because因為D. but但是，根據(jù)句意，故選B。
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