—Will Mr. Brown come and play computer games?
—No,               he has finished, his homework.
A．whenB．ifC．unlessD．once
C

試題分析：句意：-----布朗先生會來玩電子游戲嗎？----不，除非他已經(jīng)完成了他的作業(yè)。when 當……的時候；if 如果；unless 除非，如果不；once一旦……就。 故選C。
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