【題目】There is someone knocking at the door. Who ______ it be?

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

【答案】A

【解析】

試題分析：句意：有人正在敲門，它可能是誰？所給選項中只有情態(tài)動詞can有表示可能的用法，所以選A。

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