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18．在發(fā)展經(jīng)濟(jì)的同時，我們必須注意節(jié)約資源和防止污染．（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．
本句是對事物的一種看法，所以使用一般現(xiàn)在時．
結(jié)合句意可使用狀語從句的省略，while引導(dǎo)一時間狀語從句．pay attention to注意．

點評 while，when，as等引導(dǎo)的狀語從句，當(dāng)從句中的主語和主句的一致，且從句中含有be動詞時，可以省略從中的主語和be動詞．還有一點需要注意短語中pay attention to中的to為一介詞，后面跟動詞時需要用動詞的ing形式．

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