单项选择题

______ , I didn't go to the office.

A．To being sick
B．To be sick
C．Be sick
D．Being sick
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单项选择题
You should prepare ______ your part of the bill.
A．to pay
B．to paying
C．paying
D．to be paid
单项选择题
If I had not studied hard, I ______ in the exam.
A．had failed
B．would failed
C．would have failed
D．have failed
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