单项选择题

They demanded that another experiment ______.

A．be made
B．were made
C．would be made
D．had been made
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单项选择题
There is something wrong with the computer. You'd better have it ______.
A．repairing
B．repaired
C．be repaired
D．to be repaired
单项选择题
The work ______ by the time you got there.
A．has been finished
B．was finished
C．had been finished
D．will be finished
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