It is 10 years _____ we left school.

问题描述:

It is 10 years _____ we left school.
A.since B.when C.before D.after

答案是A.
翻译:自从我们离开学校以来已经十年了.
固定句型:It is some time since+从句(从句采用一般过去时).
或It has been some time since+从句(从句采用一般过去时).