单项选择题

He is ______ an important customer now and he will be back tonight.

A．calling on
B．calling up
C．calling at
D．calling for
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单项选择题
______ the employees working efficiency, the supervisor will allow them to have a coffee break.
A．Improving
B．To improve
C．Having improved
D．Improved
单项选择题
He s only got one shirt because all the rest ______ being washed.
A．is to be
B．is
C．will be
D．are
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