单项选择题

I have to ______ my visit as I"ll be very busy next week.

A．call for
B．call on
C．call off
D．call in
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单项选择题
He is not such a person and he ______ such a thing.
A．cannot have done
B．must not have done
C．should not have done
D．could not have done
单项选择题
In some countries, traffic police can ______ instant fines on speeding motorists.
A．compel
B．impose
C．charge
D．force
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