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【题目】—Winter swimming is exciting, but one can’t do it ________ he or she has got some training.

— Exactly! It can be dangerous.

A. after B. unless C. if D .while

【答案】B

【解析】句意:——冬泳是令人兴奋的,但除非他或她接受了一些训练,否则是不行的。 ——没错!这可能是危险的。A. after……之后;B. unless 除非;C. if 如果;D. while……的时候。根据语境和句意可知用unless。故选B。

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