单项选择题

The professor will ask the student to account ______ his absence from the class yesterday.

A．for
B．at
C．on
D．of
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单项选择题
I saw ______ cars and trucks outside the building at dusk.
A．an amount of
B．numbers of
C．lots of
D．plenty of
单项选择题
— She must be in the dormitory now. — No, she ______ be there. I saw her in the classroom a minute ago.
A．mustn't
B．can't
C．couldn't
D．wouldn't
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