My friend’s flight had taken off _________ I got to the airport to see him off.
A．whileB．a(chǎn)fterC．beforeD．until
C

試題分析: 句意：在我到達機場送朋友前，他的航班已經(jīng)起飛了。while當(dāng)……的時候， after在……之后， before在……之前，until直到……。take off起飛，see off送行。got to一般過去時，had taken off過去完成時，可知主語動作發(fā)生在從句之前，故選C.
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