题目内容
5.The earth will become more and more beautiful if everyone their best to protect the environment.( )| A. | try | B. | tries | C. | will try | D. | tried |
分析 如果每个人尽他们最大的能力保护环境,那么地球将会变得越来越美丽.
解答 正确答案:B.本句是由if引导的条件状语从句,一般遵循"主将从现"的原则,从句常用一般现在时,即主语+动词原形,everyone作主语,谓语应用单数形式,故根据句意选择B.try one's best表示尽某人最大能力做某事.
点评 本题考查一般现在时,基础题,掌握if条件状语从句是解题关键,并注意不定代词作主语,谓语常用单数形式.
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