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．couldn't
C．can't
D．wouldn't

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单项选择题

Arriving at the bus stop, ______ waiting there.

A．he found a lot of people
B．a lot of people were
C．he found a lot of people's
D．people were found

单项选择题

My wallet is nowhere to be found. I ______ when I was on the bus.

A．must have dropped it
B．must drop it
C．should have dropped it
D．ought to have dropped it:

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