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We can't play games before our homework____A is done B does

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We can't play games before our homework____A is done B does C will be done
We can't play games before our homework____A is done B does
直到我们的作业做完之前,我们都不能玩游戏.
  homework 被动词汇 必须被做 故在A\C间选择
  结合句式语态,A:is done 被做完的意思
  C:will be done 将要被做完
  顾一目了然选择A为正确答案.