Mymotherhasworkedinthisfactory2years.Mymotherhasworkedinthisfactory_____2years.(A)about(B)for(C)in(D)since
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题目内容：
My mother has worked in this factory 2 years.
My mother has worked in this factory _____ 2 years.
(A)about (B)for (C)in (D)since
优质解答
B
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