过去分词不是不能够当主语的?为什么这句Exposed to the sun for too much time,you will get sunburned.用Exposed当主语

题目

过去分词不是不能够当主语的?为什么这句Exposed to the sun for too much time,you will get sunburned.用Exposed当主语

答案

这句话里的expose不是主语,是一个条件从句的前半部分,（When）Exposed to the sun for too much time,you will get sunburned.
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