——They haven’t finished the work up to now. ——Well,they__________.

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问题 ——They haven’t finished the work up to now.   
——Well,they__________.

选项 A、should
B、should have
C、would
D、must have

答案B

解析 should have done意为“本应该做某事(但实际上没做)”。故选B。句子意思是:  他们到现在还没有完成工作。  唉,他们本应该完成,却没完成。
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