He thinks playing computer games .A. frustratedB. frustratingC. frustrateD. to frustrate

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A. frustrated
(答案→)B. frustrating
C. frustrate
D. to frustrate
解析：句意：他认为玩电脑游戏是令人沮丧的。现在分词作宾语补足语表示宾语正在进行的伴随性的动作，和宾语是主谓关系，结合语境可知选B。