It was very exciting what he said.
我觉得如果用that 就是强调句型了吧 这样就没有谓语了。
His words sounded very exciting.
或 It sounded very exciting about he said.
What he said sounded very exciting.(也可以用现在进行时,就是不太好)
His words sounds very exciting.
It was very excuiting that he said.