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    精英家教网 > 高中英语 > 题目详情
    ----Dad, can I go out to play basketball now ?
    ----- Sorry, you can’t ______you haven’t finished your homework.
    A．before B．untilC．asD．unless
    C 

    试题分析：句意：--爸爸，我现在可以去打篮球吗？--对不起，你不能因为你还没有完成家庭作业。因为是因果关系，用as“因为，由于”， A. before在…前面，B. until直到，D. unless 除非，所以选C。
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