问题
选择题
Miss. Gao _______ in the library for three years. But now she is a teacher.
A．worked
B．has worked
C．had worked
D．has been working
答案
答案：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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