问题描述：
What do you think made Mary so upset,------- her new bibycle
a.Losing b.Because of losing
为什么选 a不选b 为什么,
Because of losing her new bike 好像没有谓语
a.Losing b.Because of losing
为什么选 a不选b 为什么,
Because of losing her new bike 好像没有谓语
问题解答：
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