【題目】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:空氣污染在很長(zhǎng)一段時(shí)間內(nèi)仍將是一個(gè)問題,雖然我們已經(jīng)做了很多工作來解決它。考查連詞。A. though盡管,雖然(引導(dǎo)讓步狀語從句);B. since自從,由于,因?yàn),既然?/span>C. unless除非,如果不;D. if如果。根據(jù)句意空氣污染在很長(zhǎng)一段時(shí)間內(nèi)仍將是一個(gè)問題,雖然我們已經(jīng)做了很多工作來解決它,可知前后存在一種讓步關(guān)系,故答案選A。

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