B 意思是 我们中有些人还不太清楚何谓污染．
what is pollution 是句子的主语．
be clear to sb表示对某人来说很清楚,很明了．由于该句的主语是一个句子,这里的谓语动词应该用单数”is”．答案A和答案C都缺少谓语．答案D明显不对．
____ not quite clear to some of us.
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英语翻译if you are still not clear,use this tip as a way to reme