he studied hard every day he didn’t pass the exam.A. Because soB. Although butC. Althou

问题补充：

he studied hard every day, he didn’t pass the exam.

A. Because, so

B. Although, but

C. Although, /

D. Because, /

答案：

A. Because, so

B. Although, but

(答案→)C. Although, /

D. Because, /

解析：本题的含义是虽然他每天学习很努力，但是他考试不及格，although和but只能使用其一，故本题选C。