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        1. Daisy has been learning Putonghua __________ the age of five.

          A.a(chǎn)tB.sinceC.forD.in

          B

          解析試題分析:句意:Daisy在他從他五歲的時候就學(xué)普通話,F(xiàn)在完成時可以用來表示發(fā)生在過去某一時刻的,持續(xù)到現(xiàn)在的動作(用行為動詞表示)或狀態(tài)(be動詞表示)常與for(+時間段),since(+時間點或過去時的句子)連用.根據(jù)該句是現(xiàn)在完成時態(tài),the age of five 是時間點,故選B。
          考點:考查介詞的用法。

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