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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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热门试题

单项选择题It is from my grandparents________ I learned a lot.

A．who
B．whom
C．that
D．which

单项选择题What two problems can man solve by burning garbage

A．The shortage of energy and air pollution.
B．The shortage of energy and the land to hold garbage.
C．Air pollution and the shortage of fossil fuel.
D．Air pollution and the shortage of land to hold garbage.