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
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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
单项选择题
He liked the painting very much, which cost him $1, 000. However, he would gladly have paid ______ for it.
A．as much twice
B．much as twice
C．twice as much
D．as twice much
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