9.Good to see you again.It”s almost three years___we met last time.A.until B.before C.while D.9.Good to see you again.It”s almost three years___we met last time.A.until B.before C.while D.since （我选D）要理由.

9.Good to see you again.It”s almost three years___we met last time.A.until B.before C.while D.9.Good to see you again.It”s almost three years___we met last time.A.until B.before C.while D.since （我选D）要理由.
9.Good to see you again.It”s almost three years___we met last time.A.until B.before C.while D.
9.Good to see you again.It”s almost three years___we met last time.
A.until B.before C.while D.since （我选D）
要理由.

9.Good to see you again.It”s almost three years___we met last time.A.until B.before C.while D.9.Good to see you again.It”s almost three years___we met last time.A.until B.before C.while D.since （我选D）要理由.
你的选择是正确的.
It's almost three years since we met last time.= It has been almost three years since we met last time.意思是：自从我们上次见面以来,已经过了差不多3年.
不过,口语中多用前一句,书面语中多用后一句.

It is + 一段时间+since+主语+过去时+。。。表示“自。。。。以来已经有。。。。了”