It is almost five years we saw each other last time.A. beforeB. sinceC. forD. when

问题补充：

It is almost five years we saw each other last time.

A. before

B. since

C. for

D. when

答案：

A. before

(答案→)B. since

C. for

D. when

解析：“it is +一段时间+since从句”句型中，since引导的从句谓语动词若是持续性动词，常理解为某一状态的终止；若是终止性动词，则理解为某一动作的开始。本题大意，自从上次见面以来，我们已经有将近五年的时间没见面了。

故B正确。