Great efforts to increase wheat production must be made if bread shortages _____

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问题 Great efforts to increase wheat production must be made if bread shortages ______ avoided.

选项 A、will be
B、can be
C、are to be
D、were to be

答案 C

解析句意：要避免面包短缺，必须更加努力来提高小麦的产量。be+不定式表示将来，含有“按计划，必须”的意思。因此C为正确答案。

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