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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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
If you ______ him tomorrow, please ask him if he ______ to work on the farm with us.
A．see; goes
B．will see; will go
C．see; will go
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