Question

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

A．while

B．a(chǎn)fter

C．before

D．until

Answer 1

C

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(guò)去時(shí)，had taken off過(guò)去完成時(shí)，可知主語(yǔ)動(dòng)作發(fā)生在從句之前，故選C.