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Have you finished the work?

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Have you finished the work?
No half of the class _______most of the work.But some of the work__really diffcult
A.have done is B had done are
前面问句是过去嘛``所以用HAD 后面SOME嘛`所以复数``ARE
为什么还选A啊`?
前面问句不是过去哦,是现在完成时,有HAVE 在呀,所以是现在呀 所以理所当然也填HAVE WORK可是不可数名词呀,所以即使有SOME谓语动词也该是单数