下面这句话中 an event or an activity involves sth是什么成份,和这句话的语法结构?if a situation,an event or an activity involves sth,that thing is an important or necessary part or result of it
问题描述：
下面这句话中 an event or an activity involves sth是什么成份,和这句话的语法结构?
if a situation,an event or an activity involves sth,that thing is an important or necessary part or result of it
答