Miss. Gao _______ in the library for three years. But now she is a teacher.
A．workedB．has workedC．had workedD．has been working
A
本題考查時態(tài)。結(jié)合題干后半部分“她現(xiàn)在是老師”可知“她在圖書館工作三年”是“現(xiàn)在”之前的事，是 “過去”的事，所以用一般過去時。
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