[文法] after exposed to...

楼主: ambrosio (...)   2016-03-17 13:03:56
It is so cold that skin hurts and suffers from frostbites
within a few minutes after exposed to the life-threatening
coldness.
请问这里的after是当介系词吗?
后面没有主词,动词可以直接接过去分词吗?
是省略being吗?可以省略吗?算正式英文吗?
谢谢
作者: qoo27734266 (postgraduate)   2016-03-17 17:46:00
我试着答一下exposed也算分词的一种 不管是现在分词还是过去分词即可以省略主词我有讲错吗XD

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