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【题目】Air pollution will remain a problem for a long time, ______ we have done a lot to solve it.

A. though

B. since

C. unless

D. if

【答案】A

【解析】句意:空气污染在很长一段时间内仍将是一个问题,虽然我们已经做了很多工作来解决它。考查连词。A. though尽管,虽然(引导让步状语从句);B. since自从,由于,因为,既然;C. unless除非,如果不;D. if如果。根据句意空气污染在很长一段时间内仍将是一个问题,虽然我们已经做了很多工作来解决它,可知前后存在一种让步关系,故答案选A。

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