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19.The earth will be more and more beautiful if everyone       his best to love it.(  )
A.tryB.triesC.will tryD.has tried

分析 如果每个人都爱它,地球就会变得越来越美丽了.

解答 答案:B  根据"主将从现"的原则,可知主句The earth will be more and more beautiful为一般将来时,从句则为一般现在时;故选B.

点评 掌握""主将从现"的原则,根据句子给出的信息作出正确解答.

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