单项选择题

It is necessary that the students ______ more exercises to do.

A．have
B．must have
C．will have
D．can have
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单项选择题
The mayor made a ______ speech at the opening ceremony of the sport meeting, which encouraged the sportsmen greatly.
A．vigorous
B．tiring
C．flat
D．harsh
单项选择题
Because of a lack of money, we had to ______ the plan later.
A．call off
B．call on
C．call up
D．call for
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