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

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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