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        1. The cost of living in Chengdu is among the lowest in China, ________ the quality of life is probably one of the highest.

          A.since B.when C.a(chǎn)s D.while

          D  

          解析試題分析:句意:在成都的生活成本是中國(guó)最低的,而生活質(zhì)量可能是最高的之一。since 自從;when當(dāng)···時(shí),as當(dāng)···時(shí),while當(dāng)···時(shí),四者都可引導(dǎo)時(shí)間狀語(yǔ)從句,when后的從句謂語(yǔ)動(dòng)詞既可是延續(xù)性動(dòng)詞,也可是短暫性動(dòng)詞,而且還可作并列連詞,譯為“這時(shí)”。while后的從句謂語(yǔ)動(dòng)詞只能是延續(xù)性動(dòng)詞,強(qiáng)調(diào)主從句的兩個(gè)動(dòng)詞同時(shí)發(fā)生;while也可作并列連詞,表示兩個(gè)動(dòng)作的對(duì)比,譯為“而”“然而”。as則表示兩個(gè)變化中的動(dòng)作的同時(shí)性,譯為“一邊…一邊…”。所以選D。
          考點(diǎn):考查連詞。

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