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

游客2023-11-22  25

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 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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