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-Listen! There is a knock on the door. Who it be? -It must be Jack. Just now I s

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-Listen! There is a knock on the door. Who it be? -It must be Jack. Just now I s

—Listen! There is a knock on the door. Who _____ it be?

—It must be Jack. Just now I sent for him.

    A. shall  B. can     C. must    D. might

试题答案

B

解析: