They/ live/ Moscow/ before/ they/ move/ a new house/ London/ last year.
A. They had lived in Moscow before they moved into a new house in London last year.
B. They lived in Moscow before they had moved into a new house in London last year.
C. They lived in Moscow before they move into a new house in London last year.
Đáp án đúng: A
Sự kết hợp thì giữa quá khứ hoàn thành và quá khứ đơn: Trước “before” sử dụng thì quá khứ hoàn thành và sau “before” sử dụng thì quá khứ đơn.
Dịch nghĩa: Họ đã sống ở Moscow trước khi chuyển đến một ngôi nhà mới ở London vào năm ngoái.
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