52单词网 > 高中英语 > 高中英语题库 > – Do you know why the river was polluted? -- Many different factors the serious

– Do you know why the river was polluted? -- Many different factors the serious

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– Do you know why the river was polluted? -- Many different factors the serious

– Do you know why the river was polluted?

-- Many different factors ___________ the serious pollution of the river.

A．contributed toB．adjusted toC．were accustomed toD．were attached to

试题答案

A

标签：pollutedwasmanyfactorsdifferent

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