单项选择题

Jack would have been a top student in his school at the time, but he _________hard enough.

A．hadn't worked
B．should work
C．didn't work
D．won't work
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单项选择题
The seating _________of the lecture hall is 2000.
A．capability
B．capacity
C．quantity
D．ability
单项选择题
It was reported that the project _________by the end of this month.
A．will be completed
B．will have been completed
C．would have completed
D．would have been completed
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