---Do you still remember the accident?Yes. Actually, I have experienced nothing more .

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A. frighten
B. to be frightening
C. frightened
(答案→)D. frightening
解析：形容词辨析。Frighten使…害怕；frightened感到害怕的；frightening让人害怕的；结合句意可知D正确。句意：—你还记得那起事故吗？—是的。实际上我从来没有经历过更让人害怕的事情了。