单项选择题

_______, follow the directions on the bottle carefully.

A．When taken drags
B．When drugs are taken
C．When takes drags
D．When taking drags
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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
The old man is in the habit of going for a walk along the river every morning except ______it rains.
A．when
B．for
C．that
D．/
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