What do you think made Mary so happy?_____ a prize in the recent competition A.AS she won B.WonC.Wining D.Because of wining

问题描述:

What do you think made Mary so happy?_____ a prize in the recent competition A.AS she won B.Won
C.Wining D.Because of wining

选B,回答问题的主语一致,回答的时候主语可以省略。
A选项AS虽然可以作为因为讲,不过一般都作为引导原因状语从句,而回答问题缺少主句
C跟D一样,不是完整的句子结构。

c
我觉得
句子还原
-----------made Mary so happy 就是 差个 主语吧