单项选择题

From here people can see the bridge ______ construction.

A．below
B．by
C．under
D．on
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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
单项选择题
It is required that such insulator (绝热体) ______ a heat resistant material.
A．must be made of
B．should be made of
C．will be made of
D．would be made of
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