. The look on his face suggested that it was he who had broken into the house.A. frightB.

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(答案→)A. fright
B. frightened
C. frighten
D. frightening
解析：考查词形变化。fright 名词，害怕frightened 形容词，害怕的，frighten 动词，使害怕，frightening 形容词，令人害怕的，句意：他脸上害怕的表情表明就是他闯入了房子。根据语境应用名词，所以选A。