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    【题目】---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】

    试题分析: 句意: ---你们城市的雾一定很大。否则，你会按计划到达。---是的。我们的航班因大雾延误了。根据if not, you would have been here as scheduled.判断，是描述过去的事情，所以下句使用一般过去时表示过去发生的事情。故选B项。

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