问题补充：
—What did you do before you came here?
—I in a factory.
A. worked
B. am working
C. will work
D. work
答案：
(答案→)A. worked
B. am working
C. will work
D. work
解析：根据问的内容可知时态为一般过去时，故也用一般过去时来回答，故选A
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