单项选择题

If you are not ______ by then, I'll take you to see the doctor.

A．good
B．fine
C．better
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单项选择题
The old man had to do all the farm work himself, ______
A．did he
B．didn't he
C．hadn't he
单项选择题
Many ______ trees should be planted on the mountains.
A．thousand
B．thousand of
C．thousands of
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