Look at his look. It seems as if he had met a tiger.A. frightened, frighteningB. frighteni

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(答案→)A. frightened, frightening
B. frightening , frightened
C. frightened, frightened
D. frightening , frightening
解析：词义辨析。Frightened害怕的，受惊的，指人；frightening令人恐惧的，指物；句意：看他害怕的表情。好像他遇到令人恐怖的老虎。结合语境可知前文指人，下文只动物，故选A。