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
Do you think they have ______ food for all these people here
A．subsequent
B．beneficial
C．sufficient
D．average
单项选择题
The old lady ______ on hearing his son's death.
A．broke in
B．broke down
C．broke out
D．broke away
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