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Miss. Gao _______ in the library for three years. But now she is a teacher.
A.workedB.has workedC.had workedD.has been working
A
本题考查时态。结合题干后半部分“她现在是老师”可知“她在图书馆工作三年”是“现在”之前的事,是 “过去”的事,所以用一般过去时。
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