-The pollution problem here seems to get more and more serious.-Yes,something with it.A has down Bmust be down Cis doing Dwas down请帮忙讲解一些原因.

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-The pollution problem here seems to get more and more serious.-Yes,something with it.A has down Bmust be down Cis doing Dwas down请帮忙讲解一些原因.
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-The pollution problem here seems to get more and more serious.-Yes,something with it.A has down Bmust be down Cis doing Dwas down请帮忙讲解一些原因.
-The pollution problem here seems to get more and more serious.
-Yes,something with it.
A has down Bmust be down Cis doing Dwas down
请帮忙讲解一些原因.

-The pollution problem here seems to get more and more serious.-Yes,something with it.A has down Bmust be down Cis doing Dwas down请帮忙讲解一些原因.
首先它答语的主语是something,要用被动语态(be动词+动词的过去分词形式),所以A和C排除.(A是现在完成时,C是现在进行时.)
第一句话说的是get more and more serious,说明形式严峻.B选项里有个must,语气比D强烈,所以选B.
对了,选项里有个单词打错了,是done而不是down.

句子的意思是污染越来越严重，必须要采取一些措施，需要用被动语态。must在这里是必须的意思，是情态动词，后面需要用动词原形。另外，答案应该是done,而不是down.

理解中文意思就可以解了额

contamination,pollution--- the differences What is your biggest problem when learning English , and what solutions do you suggest to the probl the pollution 后面加什么介词 water pollution 前面用不用加the pollution from the traffic 英语范文 These diesels cause most of the pollution. why air pollution is the most serious? sometimes people pollution the enyironment什么意思? We are trying ___ (stop) the pollution. The pollution in Lijiang is very few. the pollution of SO2 is now the most dangerous problem of air pollution People are pollution the land,the water and the a______ The pollution came form the smokefrom the traffic..(同义句) it is easy for you____.a.to work out the problem b.working out the problem c.work out the probl The public has been warned of the danger of pollution. 是have the air polluted 还是 have the air pollution? pollution前要加the吗Many of our bad habits will cause the pollution还是Many of our bad habits will cause pollution 英语中of的疑问to solve pollution problems这里pollution和problems不都是名词吗 可以用the problems of the pollution吗?