Mary toldMe that the story bookMust ______ to the library in two days.A、be retur

游客2025-07-10  0

问题 Mary toldMe that the story bookMust ______ to the library in two days.

选项 A、be return
B、be returned
C、been returned

答案 B

解析 本题考查语态。must be done是含情态动词的被动语态。
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