Greater efforts to increase agricultural production must be made if food shortag

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问题 Greater efforts to increase agricultural production must be made if food shortage ______ avoided.

选项 A、is to be
B、can be
C、will be
D、has been

答案 A

解析时态题。if从句中的动作还没有发生，只是提出目标。be to do sth．可表示按照计划、约定将要发生的动作，故A正确。will do sth．暗含有主观意愿之意，不符题意。

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