单项选择题

They are busy ______ in their lessons before the exam.

A．going after
B．going over
C．going by
D．going ahead
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单项选择题
______ bricks, workers must press clay into blocks at first.
A．Being make
B．The making of
C．To make
D．Made
单项选择题
Only rarely ______ earthquakes occur in the United States east of the Mississippi River.
A．had
B．when
C．that
D．do
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