单项选择题

A．mustn'tB．couldn'tC．can'tD．wouldn't——She must be in th……

——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.

单项选择题My wallet is nowhere to be found. I ______ when I was on the bus.