问题
选择题
When I entered the room, I found a little boy _____ on his mother’s knees _____ to draw a picture.
A．seated; learning
B．sitting; to learn
C．seating; learning
D．sat; was learning
答案
答案：A
seat是及物动词，后没有宾语， 故此处用过去分词做后置定语 表示“坐在……”a little boy 是learn的执行者所以用learning。