单项选择题

______ , follow the directions on the bottle carefully.

A．When taken drugs
B．When drugs are taken
C．When one takes drugs
D．When taking drugs
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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
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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