【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.after
C.when
D.unless

【答案】D
【解析】句意：——這種運動是令人興奮的�！堑�，但它是危險的。人不可以做它，除非受過一些訓(xùn)練。If如果；after在……之后；when當(dāng)……的時候；Unless除非。結(jié)合句意可知該選D。

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