问几道英语选词填空题!
以下横线内选填before    when   since     that     1.It was two years ________he realized the truth.    2.It will be two years ________ the economic situation improves.    3.It was two years later ________ he realized the truth.    4.It is /has been two years ________ he lived here.    5.It was midnight ________ he arrived home.    6.It was at midnight ________ he arrived home.    7.It was not until midnight _______ he arrived home. 很急,