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    精英家教网 > 高中英语 > 题目详情
    If we _________ the earth, we must take action before it is too late.
    A．will save B．are to save C．are about to save D．are saving
    B

    试题分析：原句意思是，如果我们要拯救地球，那么在太迟之前我们必须采取行动。be to do结构，在条件状语从句中用一般现在时表示将来，答案为B。
    点评：解答此类题型要根据前后句的关系，来判断时态。be to do结构，在条件状语从句中用一般现在时表示将来。
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