单项选择题

The teacher has his students______a composition every other week.

A．to write
B．written
C．writing
D．write
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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
单项选择题
I______my wallet when I was shopping in the store.
A．must have dropped
B．should have dropped
C．could drop
D．ought to have dropped
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