They / live / Moscow/ before / they / move / London.
A. They lived in Moscow before they had moved to London.
B. They had lived in Moscow before they moved to London.
C. They was living in Moscow before they moved to London.
Đáp án: B
Giải thích: Cấu trúc: Before S + Vqk, S + had + Vp2 hoặc S + had + Vp2 before S + Vqk: dùng để mô tả một hành động xảy ra trước một hành động khác trong quá khứ.
Dịch: Họ đã sống ở Moscow trước khi chuyển đến London.
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