lost in thought,he bumped into a passer-by .
be lost in /be dressed in / be armed with 等在做状语的时候被省略了从句中的when 和系动词 be 而来的
seated /sitting in the classroom ,she thought she was the only one who accepted the praise .
lost in thought,he bumped into a passer-by .
be lost in /be dressed in / be armed with 等在做状语的时候被省略了从句中的when 和系动词 be 而来的
seated /sitting in the classroom ,she thought she was the only one who accepted the praise .