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、 to be preparing
C、 prepared
D、 preparing

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单项选择题
There is something wrong with the computer. You'd better have it （）.

A、 repairing
B、 be repaired
C、 repaired
D、 to be repaired
单项选择题
The work （） by the time you got there.

A、 has been finished
B、 had been finished
C、 was finished
D、 will be finished
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