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【题目】--This kind of sports is exciting.

--Yes,but it's dangerous.One can't do it ____ he or she has got some training.

A.if B.after C.when D.Unless

【答案】D

【解析】

试题分析:句意:-种运动是令人兴奋的。-是的,但它是危险的。可以做它除非受过一些训练。If如果;after在……之后;when当……的时候;Unless除非。结合句意可知该选D。

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