She said that the doctor must have got stuck in a traffic jam, otherwise he______by then.

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问题 She said that the doctor must have got stuck in a traffic jam, otherwise he______by then.

选项 A、would arrive
B、would have arrived
C、should arrive
D、must have arrived

答案B

解析根据句意和时间状语by then(到那时)可知，本句包含了一个otherwise引导的含蓄条件句，表示对过去情况的虚拟，所以谓语动词应用“would have+过去分词”的形式。故选B。

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