He finds watching movies because the people speak too quickly.A. frustratingB. frustratedC

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(答案→)A. frustrating
B. frustrated
C. frustrate
D. frustration
解析：frustrating形容词，令人沮丧的；frustrated形容词，失意的，挫败的；frustrate动词，失败，受挫； frustration挫折。句意：他发现看电影很令人沮丧，因为人们说话太快了。结合语境可知选A。