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【题目】I've known Sarah for nearly ten years. She __________ once my customer.

A. is B. has been C. was D. had been

【答案】C

【解析】

试题分析:本题考查的是时态。句意:我认识Sarah 近十年了。她曾经是我的一个顾客。根据句意可知,Sarah 曾经是我的一个顾客, 即现在不是了,所以选择C was 一般过去时, 表示过去的事实, A is 表示现在的事实; B has been 过去发生的动作,但是现在仍然是D had been 过去的过去。

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