单项选择题

The students in the dormitories were forbidden, unless they had special passed, ________ after 11 pm.

A．staying out
B．stay out
C．from staying out
D．to stay out
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单项选择题
Modem appliances ________ us from a good deal of household work. For instance, the dryer frees us from hanging the laundry.
A．escape
B．benefit
C．liberate
D．comfort
单项选择题
Great efforts to increase wheat production must be made if bread shortages ________ avoided.
A．will be
B．can be
C．are to be
D．were to be
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