My friend’s flight had taken off _________ I got to the airport to see him off.

A．whileB．a(chǎn)fterC．beforeD．until

C

解析試題分析: 句意：在我到達(dá)機(jī)場(chǎng)送朋友前，他的航班已經(jīng)起飛了。while當(dāng)……的時(shí)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(shí)，had taken off過去完成時(shí)，可知主語動(dòng)作發(fā)生在從句之前，故選C.
考點(diǎn)：考查連詞。

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