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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
2024-07-19
21
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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
thinking of
解析
这里是现在分词与are构成现在进行时,意为“正在考虑…”。
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