20．Their flight ______ due to bad weather．They would like to know when the flight will take off．（　�。�
A．had been delayedB．was delayed
C．has been delayedD．will be delayed

分析 他們的航班因為糟糕的天氣被耽擱了．他們想知道航班什么時候起飛．

解答 答案是C．本題考查現(xiàn)在完成時；現(xiàn)在完成是表示"過去的動作對現(xiàn)在的影響或結(jié)果"或"過去的動作一直持續(xù)到現(xiàn)在"；本題中，航班被耽擱的已經(jīng)發(fā)生，航班還未起飛，可見對現(xiàn)在產(chǎn)生了影響，故用完成時的被動語態(tài)；選C．

點評 對時態(tài)的選擇，要在把握時態(tài)的基本用法的基礎(chǔ)上，根據(jù)具體語境和題干中的時間推斷時態(tài)，同時關(guān)注特殊的結(jié)構(gòu)．

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