【题目】The boy entered the room quietly in order to avoid __________ his parents.
A. being waken up B. to wake up
C. waking up D. to have waken up
在线课程【答案】C
【解析】句意：为了避免惊醒父母，那个男孩悄悄地进入房间。动词avoid后跟动词-ing形式作宾语，因为动词wake up与句子主语the boy有主动关系，故用动词-ing形式的一般式，C项正确。