单项选择题

I saw Mr. White ______ for the bus at the bus station just now.

A．to waiting
B．to wait
C．waiting
D．waited
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单项选择题
______ in the classroom now is not allowed.
A．To sleep
B．Sleeping
C．Slept
D．Being slept
单项选择题
The two students ______ for two hours, I wonder what they are talking about.
A．talks
B．are talking
C．talked
D．have been talking
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