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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单项选择题
People will find this valley a beautiful place______ they may spend their weekends.
A．when
B．where
C．that
D．which
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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