单项选择题

The number of students in a foreign languages class ______ usually limited to no more than thirty.

A．have
B．are
C．is
D．were
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单项选择题
Trains used to stop here to ______ us.
A．get off
B．pick up
C．pull up
D．get past
单项选择题
We ______ your terms carefully but ______ to say that we cannot accept them.
A．are studying; regret
B．have studied; are regretting
C．have studied; regret
D．have been studying ;have regretted
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