让步状语从句和非谓语

刘老师，帮忙看下这几个句子正确吗？

Having been told many times,he didn't know how to do it.

Though he had been told many times,he didn't know how to do it.

Though told many times,he didn't know how to do it.

这三个句子是不是可以互换？谢谢了

刘永科 - 教育出版集团英语总顾问 & 英语系列图书主编

擅长：语法理论,语言学,文化背景 | 采纳率 86% | 回答于 2021-01-30 22:21

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