Her eyes on her plate and in a short time, she was busy .
A. were fixed, eating
B. fixed, to eat
C. were fixed, to eat
D. fixed, eating
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(答案→)A. were fixed, eating
B. fixed, to eat
C. were fixed, to eat
D. fixed, eating
解析：本题考查语态和非谓语动词。eyes是fix的承受着，要用被动语态； be busy doing sth忙于做某事。