it is five years since my dear aunt ( )herea leftb has been leavingc is left d had left选哪个?为什么?

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it is five years since my dear aunt ( )herea leftb has been leavingc is left d had left选哪个?为什么?
it is five years since my dear aunt ( )here
a left
b has been leaving
c is left
d had left
选哪个?为什么?

it is five years since my dear aunt ( )herea leftb has been leavingc is left d had left选哪个?为什么?
a
固定用法
It is +时间段+since +sb+did sth

a

a

选择A

A,since后面的从句一般用一般过去时