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  3. We were caught in a traffic jam. By the time we arrived at the airport the plane______.

We were caught in a traffic jam. By the time we arrived at the airport the plane______.

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问题 We were caught in a traffic jam. By the time we arrived at the airport the plane______.
选项 A、will take off
B、would take off
C、has taken off
D、had taken off
答案D
解析 “by the time+过去某个时间”作时间状语时，主句用过去完成时，表示从句所表示的动作在过去某个时间之前已经完成，即发生在“过去的过去”。本句表示“在我们到达之前飞机就已经起飞了”，所以选D。
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