—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

B 【解析】句意：——冬泳是令人興奮的，但除非他或她接受了一些訓(xùn)練，否則是不行的。 ——沒錯！這可能是危險的。A. after在……之后；B. unless 除非；C. if 如果；D. while當(dāng)……的時候。根據(jù)語境和句意可知用unless。故選B。
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