When I entered the room, I found a little boy on his mother’s knees to draw a picture.A.

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→)A. seated; learningB. sitting; to learn C. seating; learningD. sat; was learning解析：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。

和我的回答一样，看来我也对了

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