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18.在发展经济的同时,我们必须注意节约资源和防止污染.(attention)While developing economy,we must pay attention to saving resources and preventing pollution..

分析 While developing economy,we must pay attention to saving resources and preventing pollution.

解答 While developing economy,we must pay attention to saving resources and preventing pollution.
本句是对事物的一种看法,所以使用一般现在时.
结合句意可使用状语从句的省略,while引导一时间状语从句.pay attention to注意.

点评 while,when,as等引导的状语从句,当从句中的主语和主句的一致,且从句中含有be动词时,可以省略从中的主语和be动词.还有一点需要注意短语中pay attention to中的to为一介词,后面跟动词时需要用动词的ing形式.

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