改错：I didn’t know there used be a new train station there in the past

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改错：I didn’t know there used be a new train station there in the past

改错：I didn’t know there used be a new train station there in the past
改错：I didn’t know there used be a new train station there in the past

改错：I didn’t know there used be a new train station there in the past
I didn’t know there used to be a new train station in the past.正确答案