单项选择题

The boss kept the visitor ______ in the waiting room for him.

A．wait
B．to wait
C．waiting
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单项选择题
There are many valuable things ______ in the history museum.
A．on duty
B．on time
C．on show
单项选择题
Neither of my parents ______ in this company.
A．works
B．are working
C．work
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