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--What do you think made Mary so upset? --__ her bicycle.

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--What do you think made Mary so upset? --__ her bicycle.
--What do you think made Mary so upset?
--__ her bicycle.
A.As she lost
B.Lost
C.Losing
D.Because of losing
答案是C请问为什么不能选A选项as不是可以引导原因状语从句的吗?
C
要看问句中作主语的What.答语的语言材料也得能做主语,明白?不是缺状语,而是主语!