(last week) (a old friend of mine) (came to) beijing and (paid me a visit)四个括号里的,哪个错了呢?应该怎么改?

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(last week) (a old friend of mine) (came to) beijing and (paid me a visit)四个括号里的,哪个错了呢?应该怎么改?
(last week) (a old friend of mine) (came to) beijing and (paid me a visit)
四个括号里的,哪个错了呢?应该怎么改?

(last week) (a old friend of mine) (came to) beijing and (paid me a visit)四个括号里的,哪个错了呢?应该怎么改?
第二个括号里的a改成an