单项选择题

Mary told me that the story book must ______ to the library in two days.

A． be return
B． be returned
C． been returned
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单项选择题
He ______ but ______ nothing.
A． heard; listened
B． listened; heard
C． listened to; heard
单项选择题
The little boy has by his sister.
A． been laughed at
B． laughed at
C． laughed
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