He was carrying on his back an oxygen generator,without whic
He was carrying on his back an oxygen generator,without which he could hardly breathe,as the dark clouds floating in the air are a sure sign of extremely serious enviromental pollution.
赞 dongyanhong 幼苗
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which引导的定语从句，修饰oxygen generator,可以这样理he could hardly breathe without the oxygen generator.当作为从句时without 要放在引导词which 之前。as 引导原因状语从句，说明他是因为空气污染才背氧气瓶。
1年前
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你能帮帮他们吗