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
It is from my grandparents ______I learned a lot.
A．who
B．whom
C．that
D．which
单项选择题
The best title for the passage may be（）

A．Garbage and the Earth
B．Fossil Fuel and Garbage
C．Land and Garbage
D．Garbage —Energy Source
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