15.________ it comes to the increasing use of motor vehicles in the cities,some people think it should be limited.( 。
A.BecauseB.OnceC.WhenD.While

分析 當(dāng)談到城市中日益增長的機(jī)動車使用問題時,一些人認(rèn)為機(jī)動車的使用應(yīng)該受到限制.

解答 答案:C.
本句考查句型when it comes to sth,為一固定句型,表示當(dāng)談到…的時候;結(jié)合句子的意思可知,本句屬于when引導(dǎo)的時間狀語從句;故選C.

點評 本題考查時間狀語從句的連接詞,在充分分析句型再結(jié)合語義的基礎(chǔ)上便能選出正確答案,同時要注意其他選項的意思

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