Greater effort to increase food production must be made if we ______ meet an increasing demand by the growing population.

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问题 Greater effort to increase food production must be made if we ______ meet an increasing demand by the growing population.

选项 A、can
B、may
C、are to
D、should

答案C

解析 句子结构题。本题考查情态动词和be to do结构的区别。A  can“能够,可以,许可”;B  may“可能,允许,可以”;C  be to do表示按计划或安排要发生的事或打算做的事,比如:The mayor is to visit our school tomorrow.(市长明天来参观我们学校。)还可以表示强制性,相当于情态动词must,比如:You are to hand in your homework tomorrow.(你明天必须交作业。)D  should“应当,应该”。根据题意,C  为正确答案。
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