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问题: 初中单选题

It ___ ten year since I met him last time.
A. has been B. is C. was
请帮忙选出答案,并说出理由,越详细越好

解答:

B
本来如果表示动作,应该用现在完成时。但因为时间段,就可以用系动词了。你也可以把它当作固定的句型来记。
It is some time since +一般过去时
除此之外,还有:
It will be some time since +一般现在时
It was some time since +过去完成时