I began to learn Japanese----2005 and I have been learn ing it for 6 years..A in B since 为什么?

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I began to learn Japanese----2005 and I have been learn ing it for 6 years..A in B since 为什么?
I began to learn Japanese----2005 and I have been learn ing it for 6 years..A in B since 为什么?

I began to learn Japanese----2005 and I have been learn ing it for 6 years..A in B since 为什么?
in
因为主句是一般过去时,动作不延续

选in
I began to learn用的是一般过去时,不能选since since前的主句必须是完成时

B since

in
因为主句是一般过去时
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