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Pollution has become a serious problem in almost all the big cities of the wo
Pollution has become a serious problem in almost all the big cities of the wo
游客
2023-10-03
33
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问题
Pollution has become a serious problem in almost all the big cities of the world. City people are becoming more and more worried about how they can (11) pollution. They are also concerned about whether the government is doing enough to (12) the e [br]
选项
答案
protect
解析
这里是动词不定式表示目的,意为“保护 (环境) ”。
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