2、逻辑主语+V-ed
该构成形式内部的逻辑主语是分词的动作承受者。如：
1._________, the train started.
A. The signal given B. Giving the signal B. The signal being given D. The signal giving
2.__________, the train started.
A. After having given the signal B. After the signal given
C. Giving the signal D. After the signal was given
