11．All flights ______ because of fog．I'm afraid you will have to stay here for another day．（　　）
A．have been called offB．called off
C．had been put offD．have put off

分析 因?yàn)榇箪F所有的航班都被取消．恐怕你不得不在這里再呆一天．

解答 答案是A．本題考查時(shí)態(tài)；現(xiàn)在完成時(shí)表示"過去的動(dòng)作一直延續(xù)到現(xiàn)在"或"過去的動(dòng)作對現(xiàn)在產(chǎn)生影響或結(jié)果"；根據(jù)語境"航班被取消"對現(xiàn)在的影響是"你不得不在這里再呆一天"，故用現(xiàn)在完成時(shí)的被動(dòng)語態(tài)，答案是A．

點(diǎn)評 對時(shí)態(tài)的選擇，要在把握時(shí)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(shí)間推斷時(shí)態(tài)，同時(shí)關(guān)注特殊的結(jié)構(gòu)．

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