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My parents are always___on about how much better life was 20 years ago.

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This question belongs to "Luyện tập chuyên sâu Phrasal Verbs nhóm A & Back/Bang." on Học Mỗi Ngày. Review the answer, solution, and related items in the same set to study more effectively.

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My parents are always___on about how much better life was 20 years ago.

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