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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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