很明显是B!
为什么?从句子的意思,A是出于某种原因
c个人内心的想法
b我的看法想法
（ ）the air pollution is the most serious problem .We should
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相关问题
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why air pollution is the most serious?
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The problem of air pollution is becoming more serious ______
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Air pollution is___most serious problem in many major cities
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Air pollution is___most serious problem in many major cities
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Pollution problem is very serious. Can we _____? [
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It is urgent that the acute problem of air pollution in the
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We should try to stop the air pollution _____(live) a better
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we should try our best to prevent the air pollution _____(li
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Now the air pollution in this city ( ) more and more serious
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We mustn't ______ (pollution) the air.