单项选择题

The hospital ______ last year.

A．built
B．was built
C．has been built
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单项选择题
The TV set is very nice. How long have you ______ it
A．bought
B．had
C．taken
单项选择题
We have studied for two hours. Let's stop ______.
A．have a rest
B．to have a rest
C．having a rest
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