【题目】Not having finished his homework，________ to play computer games.
A.so he was forbidden
B.he was forbidden
C.his mother forbad him
D.his mother didn't allow him

【答案】B
【解析】根据句子结构可以看出Not having finished his homework在此处作原因状语，与后面的句子不是并列关系。所以首先排除A。另外，当v.ing形式作状语时，v.ing形式的逻辑主语和句子的主语要一致；句意：没有完成家庭作业，他被禁止玩电脑游戏。根据句意，故选B。