问题
单项选择题
Before she began to study at Beijing University, she（）in a factory for five years.
A.had worked
B.worked
C.has worked
D.would work
答案
参考答案：A
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Before she began to study at Beijing University, she（）in a factory for five years.
A.had worked
B.worked
C.has worked
D.would work
参考答案：A