He ____________ (一定是在竞争幸存下来), for his company is still running normally.must hav

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问题 He ____________ (一定是在竞争幸存下来), for his company is still running normally.

选项

答案 must have survived the competition

解析 ①“幸存”survive，为及物动词；②“must have done”对过去发生事情的肯定推测。

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