单项选择题

In the office you will see the sign" ______ ".

A．No Parking
B．No Photos
C．No Smoking
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单项选择题
The boss kept the visitor ______ in the waiting room for him.
A．wait
B．to wait
C．waiting
单项选择题
There are many valuable things ______ in the history museum.
A．on duty
B．on time
C．on show
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