----Dad, can I go out to play basketball now ?
----- Sorry, you can’t ______you haven’t finished your homework.
A．before B．untilC．a(chǎn)sD．unless
C 

試題分析：句意：--爸爸，我現(xiàn)在可以去打籃球嗎？--對(duì)不起，你不能因?yàn)槟氵�沒有完成家庭作業(yè)。因?yàn)槭且蚬P(guān)系，用as“因?yàn)�，由于”�?A. before在…前面，B. until直到，D. unless 除非，所以選C。
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