His failure made him aware____he had made a great mistake in working out the planA.of that B.of C.that D.that of

His failure made him aware____he had made a great mistake in working out the planA.of that B.of C.that D.that of
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

His failure made him aware____he had made a great mistake in working out the planA.of that B.of C.that D.that of
C be aware that+从句意思为知道,了解