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
The years of hard work had deep ______ on her character.
A．effect
B．effort
C．offer
D．afford
单项选择题
Mercury (水银) is ______ all metal because it is liquid.
A．more than difference
B．most different in
C．more difference of
D．the most different of
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