__ three years ago.A,since B,for C,about

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__ three years ago.A,since B,for C,about
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__ three years ago.A,since B,for C,about
__ three years ago.A,since B,for C,about

__ three years ago.A,since B,for C,about
Since three years ago 用于完成时
about three years ago 用于过去式

C 大约

似乎只有A能跟……ago

有下文吗?

C因为AGO不能拥在完成时态中
只能用于简单过去时态