【題目】---The fog in your city must have been very thick; if not, you would have been here as scheduled.

---Yes. Our flight _________ by the thick fog.

A. has put off B. was put off

C. had been put off D. put off

【答案】B

【解析】

試題分析: 句意: ---你們城市的霧一定很大。否則，你會按計劃到達(dá)。---是的。我們的航班因大霧延誤了。根據(jù)if not, you would have been here as scheduled.判斷，是描述過去的事情，所以下句使用一般過去時表示過去發(fā)生的事情。故選B項。

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