【題目】--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.a(chǎn)fter C.when D.Unless

【答案】D

【解析】

試題分析:句意:-種運(yùn)動(dòng)是令人興奮的。-是的,但它是危險(xiǎn)的。可以做它除非受過(guò)一些訓(xùn)練。If如果;after在……之后;when當(dāng)……的時(shí)候;Unless除非。結(jié)合句意可知該選D。

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