单项选择题

The years of hard work had deep ______ on her character.

A．effect
B．effort
C．offer
D．afford
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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
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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