6000 câu trắc nghiệm tổng hợp Tiếng Anh 2024 có đáp án (Phần 20)

________ he was tired, he stayed up late to finish his project

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________ he was tired, he stayed up late to finish his project.

If

Although

Because

However

Giải thích

Đáp án đúng là: B