单项选择题

It is requested that every student ______ a paper on sustainable development.

A．writes
B．wrote
C．writing
D．write
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单项选择题
There is no point ______ it again to him, for he never listens to our advice.
A．saying
B．to say
C．say
D．said
单项选择题
The only way to do that is to ______ expenses.
A．decrease
B．diminish
C．lessen
D．reduce
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