—Must I renew the book now? —Yes, of course. In fact, you______that yesterday.A、

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问题 —Must I renew the book now? —Yes, of course. In fact, you______that yesterday.

选项 A、must do
B、should have done
C、should do
D、must have done

答案 B

解析句意：一我必须要现在就续借这本书吗?一当然。实际上，你昨天就该这么做了。该对话中回答是对过去的虚拟，表示与过去事实相反的情况，根据句意，应当使用结构“should have done．”故选B。

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