The failure of his plan made him that he had made a great mistake in working out the plan

网友回答

A. be aware
B. aware of
(答案→)C. aware
D. be aware of
解析：考查形容词做宾语补足语：“make+宾语+adj”这个结构中形容词做宾语补足语，be aware of后面接名词或动名词，be aware后面可以接that从句。句意：计划的失败使他意识到在制定计划的时候犯了一个严重的错。选C。