I've known Sarah for nearly ten years．Sh...

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

A．isB．has been

C．wasD．had been

C 【解析】试题解析：本题考查的是动词的时态。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。故选C。

考点分析：

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