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5.If we ______ take environmental problems seriously,the earth _______ worse and worse.(  )
A.don't; will beB.won't; isn'tC.won't; isD.don't; won't be

分析 如果我们不严肃对待环境问题,地球就会变得越来越糟糕.

解答 答案:A 结合语境可知主句描述的是将来的事情,故用一般将来时态.因为主句没有实意动词,所以应用be动词,放在will后面跟原形be即可;当主句描述将来动作时,英语中由if引导的条件状语从句一般用一般现在时态表将来.从句的主语为we,所以用don't.故选A.

点评 此题考查if条件状语从句的用法.做此类题的关键是把握好主句和从句的时态.要学生记住主句用一般将来时,含有if的从句用一般现在时表将来.

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