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He was very tired but he kept on working

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He was very tired but he kept on working.

Despite very tired, he kept on working.

Though his tiredness, he kept on working.

Although he was very tired, but he kept on working.

He kept on working although he was very tired.

Giải thích

Chọn đáp án D

Giải thích : : mệnh đề quan hệ chỉ sự nhượng bộ: although: dù – but: nhưng. Một câu chỉ dùng một trong 2 từ này.