My hometown has changed a lot __I left it.A.since B.after C.when D.as

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Myhometownhaschangedalot__Ileftit.A.sinceB.afterC.whenD.asMyhometownhaschangedalot__Ileftit.A.sinceB

My hometown has changed a lot __I left it.A.since B.after C.when D.as
My hometown has changed a lot __I left it.
A.since B.after C.when D.as

My hometown has changed a lot __I left it.A.since B.after C.when D.as
选A since
自从我离开后我的家乡改变了许多.
如果选after的话,前面不应该用现在完成时,My hometown changed a lot after I left 这样才是对的.
when代表同时进行,
as代表当时正在进行的一件事,如果用as I left,意思就是当我离开的时候家乡变化很大,家乡变化不可能是一下子就变化的,所以这里不合适

选A 主句是现在完成时态 ,应该用since.其他的选项都不用于现在完成时态