____ three years since i left school.Now I miss my classmate very much.A.It was B.It have beenA.Itwas B.It have been C.It is D.It had been 为什么不选b呢?

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____ three years since i left school.Now I miss my classmate very much.A.It was B.It have beenA.Itwas B.It have been C.It is D.It had been 为什么不选b呢?
____ 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?

____ three years since i left school.Now I miss my classmate very much.A.It was B.It have beenA.Itwas B.It have been C.It is D.It had been 为什么不选b呢?
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)

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。

选A. It was

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。

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