问题补充：
computer games made his mother worried.
A. That the child was addicted to play
B. The child’s being addicted to playing
C. The child’s being addicted to play
D. What the child addicted to playing
答案：
A. That the child was addicted to play
(答案→)B. The child’s being addicted to playing
C. The child’s being addicted to play
D. What the child addicted to playing
解析：考查动名词做主语：句意：这个孩子沉迷于电脑游戏使妈妈很担心。Made是谓语动词，前面的内容是主语，用逻辑主语The child’s+动名词 being addicted to playing
做主语。Be addicted to里面的to是介词后面接动名词，选B。
