单项选择题

______ the balcony, it could have saved me a lot of troubles.

A．Have I known
B．Had I known
C．I have known
D．I had known
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单项选择题
Now almost all the students have a monthly ______ towards their expenses.
A．salary
B．allowance
C．wage
D．fee
单项选择题
We made several plans for our holiday, but we went to Xi'an ______ the end.
A．at
B．on
C．by
D．in
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