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
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He s only got one shirt because all the rest ______ being washed.
A．is to be
B．is
C．will be
D．are
单项选择题
When people talk, they keep a certain ______ from someone they talk with.
A．distance
B．scope
C．range
D．boundary
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