--What made her so upset? A. Lost her bike.B. Losing her bike C. She lost her bike .D.

问题补充：

--What made her so upset?

--

A. Lost her bike.

B. Losing her bike,

C. She lost her bike .

D. Because of losing her bike.

答案：

A. Lost her bike.

(答案→)B. Losing her bike,

C. She lost her bike .

D. Because of losing her bike.

解析：动名词用法。根据句意：丢了自行车让她如此难过。Losing her bike动名词短语在句中做主语。