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“Shall Mary come and play computer games?” “No, _______ she has finished her homework.”

A. when  B. since

C. unless D. as soon as

C。


解析:

此句为省略句,答句句首的 No 表明其后省略的是一个否定句,全句补充完整为:She can’t play computer games unless she has finished her homework.

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