"When did you finish your homework, David?" asked his mother.

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His mother asked David when he had finished his homework.

His mother asked David when he finished his homework.

His mother asked David when did he finish his homework.

His mother asked David when he has finished his homework.

Giải thích

Hướng dẫn giải:

Đáp án đúng: A

Câu tường thuật:

• Lùi thì: did finish → had finished

• Đổi cấu trúc câu hỏi → mệnh đề thường

Dịch nghĩa: Mẹ của David hỏi cậu ấy đã hoàn thành bài tập khi nào.