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
Because of the bad food he had eaten, his stomach began to ______.
A. pain
B. be hurt
C. ache
D. harm
单项选择题
The disappearance of her paper has never been ______.
A. counted for
B. looked up
C. accounted for
D. checked up
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