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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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
An oil-field in the North Sea can cost hundreds of millions of pounds to bring into ______.
A．produces
B．productivity
C．production
D．products
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