问题
单项选择题
How long have you worked here?（）
A.Since about two years.
B.I do not know.
C.For about two years.
D.Who knows.
答案
参考答案：C
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How long have you worked here?（）
A.Since about two years.
B.I do not know.
C.For about two years.
D.Who knows.
参考答案：C