—Will Mr. Brown come and play computer games?
—No,               he has finished, his homework.

A.when B.if C.unless D.once 

C

解析試題分析:句意:-----布朗先生會(huì)來(lái)玩電子游戲嗎?----不,除非他已經(jīng)完成了他的作業(yè)。when 當(dāng)……的時(shí)候;if 如果;unless 除非,如果不;once一旦……就。 故選C。
考點(diǎn):考查連詞的用法。

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