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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单项选择题
He actually didn't see the man ______ the room, but he heard them ______ in it.
A. to enter, laugh
B. enter, to laugh
C. to enter, laughing
D. enter, laughing
单项选择题
Because of the complexity of the modem machine, most offices require secretaries ______.
A. to have specified training
B. specified in training
C. to train specifiedly
D. training specified
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