【題目】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】

試題分析：本題考查的是時態(tài)。句意：我認識Sarah 近十年了。她曾經(jīng)是我的一個顧客。根據(jù)句意可知，Sarah 曾經(jīng)是我的一個顧客， 即現(xiàn)在不是了，所以選擇C was 一般過去時， 表示過去的事實， A is 表示現(xiàn)在的事實； B has been 過去發(fā)生的動作，但是現(xiàn)在仍然是D had been 過去的過去。

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