单项选择题

I'm very busy ______ for the exam now. Will you come again at some other time

A．to prepare
B．prepared
C．to be preparing
D．preparing
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单项选择题
They demanded that another experiment ______.
A．be made
B．were made
C．would be made
D．had been made
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
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