Question

____ three years since i left school. Now I miss my classmate very much. A. It was B. It have been

A. It
was B.
It have been C. It is D. It had been

为什么不选b呢？

Answer 1

选C，It is + 段时间 + since... / It has been + 段时间 + since...表示“从……起已有多长时间了”。两句型意思相同， 前者是规范说法， 后者是口语说法。
用法：since从句中常用一般过去时，若从句中是持续性动词的一般过去时， 则表示该动作结束有多长时间了。如：
It is three years since he smoked. 他不吸烟已有3年了。
试比较：
It is three years since he began to smoke.
t is three years since he has smoked. 两句均意为：他吸烟已有3年了。

注意：在这种结构中， since引导的从句绝对不能用否定式的谓语动词来表示否定意义， 试比较：
他好久没学汉语了。
误：It is a long time since be didn’t study Chinese.
正：It’s a long time since he studied Chinese.
(studied为持续性动词， 应从其动作结束时算起)

Answer 2

there be 句型与 have 都可以表示有，如果同时用，就重复了，
这是选择或改错常出现的，你要记住哦。
学习进步。

Answer 3

如果B选项是It has been就可以选了，it是第三人称单数，谓语应该用三单形式。

Answer 4

选A. It was