-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.

-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