单项选择题

It was believed that there was no limit（）the energy resources on our earth.

A．for
B．off
C．to
D．on

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单项选择题
The lecture hall in the university has a seating（）of over 2 000, but that night only 1 000 people were present.

A．ability
B．capacity
C．capability
D．possibility
单项选择题
The work（）by the time you get there.

A．will have been done
B．was done
C．had been done
D．has done
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