单项选择题

He kept a ______ hold on her hand as he helped her over the fence.

A．solid
B．stiff
C．firm
D．rigid
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单项选择题
A long time ago, at a national conference on biology, he cautiously ______ his new theory on life.
A．advanced
B．relieved
C．produced
D．thrust
单项选择题
Williamsburg has now been restored so that it looks as it ______ during the 18th century.
A．could
B．would
C．was
D．did
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