英语词汇题目
问题描述：
英语词汇题目
Who is the first__(know) this news?
A bird was seen __(fly)into the room
答
knowing用到了一个结构be first doing sth
to fly 鸟被看见飞进屋里 fly是瞬间动词不能“被看见正在飞进屋里” 所以不能是see doing是瞬间动词时,只能是see do改被动语态就必须be seen to do