单项选择题

A well coherent discourse ______ good choice of cohesive devices and semantic selection among other things.

A．calls for
B．calls on
C．calls up
D．calls forth
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单项选择题
Football playing will continue to be ______ it is today—the most popular game for boys in schools.
A．as
B．how
C．which
D．what
单项选择题
With so much work to do, John ______ to play games last night.
A．mustn't go
B．wouldn't go
C．oughtn't to go
D．shouldn't have got
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