【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：-這種運動是令人興奮的。-是的，但它是危險的。不可以做它除非受過一些訓練。If如果；after在……之后；when當……的時候；Unless除非。結(jié)合句意可知該選D。

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