20xx人教版高中英語必修四unit 4《body language》（section 2）課后練習1(文件)
【正文】 had been bitten by a snake, she was frightened of it. → Having been bitten by a snake, she was frightened of it. John was away, Tom had to do the work. → John being away, Tom had to do the work. it is Sunday, we needn’ t go to school. → It being Sunday, we needn’ t go to school. he didn’ t know what to do, he came to her for help. → Not knowing what to do, he came to her for help. she hadn’ t received his reply, she rang him up again
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