单项选择题

The authorities spend a lot of money ______ keeping the streets and parks clean.

A．in
B．on
C．up
D．out
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单项选择题
You can fly to London this evening ______ you don't mind changing planes in Paris.
A．unless
B．except
C．so far as
D．provided
单项选择题
We'll do what we can to get the goods ______ on time. said the manager of the company.
A．reached
B．delivered
C．returned
D．come
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