I _______________ the office when the telephone rang.

A. was about to leave B. would leave C. left D. was to leave
选哪个为什么？？

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A. was about to leave
表示即将发生的动作，在时间中侍上指最卖悔吵前悉近的将来。如：
We are about to start. 我们就要出发了。

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