单项选择题

Classes________, the students left for home without delay.

A．were over
B．being over
C．are over
D．over
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单项选择题
I can’’t find the recorder in the room. It________ by somebody.
A．must have taken
B．may have taken
C．may have been taken
D．should have been taken
单项选择题
Women all over the world are_________ equal pay for equal jobs.
A．calling on
B．calling about
C．calling off
D．calling for
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