单项选择题

This will improve their working conditions and enable them to double the______.

A．goods
B．quantity
C．output
D．product
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单项选择题
You had better______ that fellow. I don't trust him.
A．look down upon
B．keep an eye on
C．get the better of
D．do away with
单项选择题
I______ my teacher to write a reference letter to me if I see her.
A．have asked
B．ask
C．will ask
D．asked
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