单项选择题

______ in the classroom now is not allowed.

A．To sleep
B．Sleeping
C．Slept
D．Being slept
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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
单项选择题
They talked as if they ______ good friends for years.
A．are
B．were
C．had been
D．have been
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