He learned English for three years. Then he moved to London. A. After he had moved to London, he learned English for three years. B. By the time he moved to London, he had learned English f

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He learned English for three years. Then he moved to London.

After he had moved to London, he learned English for three years.

By the time he moved to London, he had learned English for three years.

After he moved to London, he had learned English for three years.

By the time he had moved to London, he learned English for three years.

Giải thích

Đáp án B

Giải thích: By the time = Vào lúc

Dịch: Anh ấy đã học tiếng Anh trong ba năm. Sau đó, anh chuyển đến London.

= Vào thời điểm anh ấy chuyển đến London, anh ấy đã học tiếng Anh được ba năm.