His failure made him aware he had made a great mistake in working out the plan.A. of that

问题补充：

His failure made him aware he had made a great mistake in working out the plan.

A. of that

B. of

C. that

D. that of

答案：

A. of that

B. of

(答案→)C. that

D. that of

解析：考查词语搭配。“意识到”Be aware of sth或者be aware that +从句。句意：他的失败使他意识到在制定计划时他犯了很大错误。