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my mother ( )in that factory at the age of 18. A.had worked

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my mother ( )in that factory at the age of 18. A.had worked B.has worked C. worked D. works
请说明原因.
my mother ( )in that factory at the age of 18. A.had worked
选C啊
我妈妈18岁的时候在那个工厂工作
A是过去完成时 表示18岁开始工作到过去某一时间,比如从18到23 之后就不在了
B是现在完成时 表示从18岁开始一直在那工厂工作,现在也在
D是现在时 与18岁不符
本句时间状语是过去具体时间点,不是时间段,所以直接用过去时就好了
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