John, how lazy you are J This work______three days ago.

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问题 John, how lazy you are J This work______three days ago.

选项 A、should have done
B、must have been done
C、should have been done
D、might have done

答案C

解析这份工作本该三天前完成的。should have done表示应该做而没有做，含有责怪之意。must have done意为“一定做了”，表示肯定的推测。

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