单项选择题

The machine needs a complete ______ since it has been in use for over ten years.

A．amending
B．fitting
C．mending
D．renovating
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单项选择题
As it turned out to be a small house party, we ______ so formally.
A．needn't dress up
B．did not need have dressed up
C．did not need dress up
D．needn't have dressed up
单项选择题
Greater efforts to increase agricultural production must be made if food shortage ______ avoided.
A．is to be
B．can be
C．will be
D．has been
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