问题描述：
选择题： 16. ---What do you think made Mar upset? --- ___________ her new bicycle.
A. As she lost B. Lost C. Losing D. Because of losing 答案是C,请问为什么不是A或者D
A. As she lost B. Lost C. Losing D. Because of losing 答案是C,请问为什么不是A或者D
问题解答：
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