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There'ssomeoneknockingonthedoor.Who

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問題詳情:

There'ssomeoneknockingonthedoor.Who

There's someone knocking on the door. Who _____it be?

—It must be Mary. She promised to be here at 8: 00

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


【回答】

D

知識點:情態動詞

題型:選擇題

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