【題目】—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:——冬泳是令人興奮的,但除非他或她接受了一些訓(xùn)練,否則是不行的。 ——沒(méi)錯(cuò)!這可能是危險(xiǎn)的。A. after……之后;B. unless 除非;C. if 如果;D. while當(dāng)……的時(shí)候。根據(jù)語(yǔ)境和句意可知用unless。故選B。

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