单项选择题

Greater efforts to increase agricultural production must（）if food shortage is to be avoided．

A．be made
B．make
C．have made
D．have been made

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单项选择题
She never expected（）the chairwoman of the committee.

A．to elect
B．to be electing
C．to be elected
D．be elected
单项选择题
The food shows no sign of（）.

A．touched
B．being touched
C．having been touched
D．having touched
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