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        1.  My friend’s plane had taken off    I got to the airport to see him off.

          A.until B.while
          C.a(chǎn)fter D.before

          D

          解析試題分析:句意:在我到機場為朋友送行前,我們的朋友的飛機已經(jīng)起飛了。根據(jù)及根據(jù)的時態(tài)過去完成時,可知飛機起飛在到機場之前,故選D。
          考點:考查連詞的用法。

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