______ he had worked hard all the time, ...

______ he had worked hard all the time, he failed the exam again.

A．If

B．As

C．While

D．Because

C 【解析】连词辨析。While有一特特殊用法，=though。结合句意可知C正确。句意：尽管他一直很努力，但是他又一次考试不及格。

考点分析：

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