单项选择题

The missing boys were last seen ______near the river.

A．playing
B．to be playing
C．play
D．to play
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单项选择题
-Smoking is bad for your health. -Yes, I know. But I simply can't______.
A．give it up
B．give it in
C．give it out
D．give it away
单项选择题
Although he has taken a lot of medicine, his health ______poor.
A．proves
B．remains
C．maintains
D．continues
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