单项选择题

She______be ill because I saw her playing tennis just now.

A．can't
B．couldn't
C．mustn't
D．may not
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单项选择题
The teacher has his students______a composition every other week.
A．to write
B．written
C．writing
D．write
单项选择题
He abandoned a career that______to his becoming one of the most influential people in the world.
A．could have led
B．would lead
C．should have led
D．must lead
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