As he went in to see the 为什么前面要加as
问题描述：
As he went in to see the 为什么前面要加as
答
As he went in to see the doctor.
当他进去看医生的时候.
as
conj.因为；依照；当…时；随着；虽然
prep.当作；以…的身份；如同
adv.同样地；和…一样的
这里是【当…时】