I couldn't understand（ ） the baby alone.A.why she left B.why did she leave C.why had she left D.why she had left

I couldn't understand（ ） the baby alone.A.why she left B.why did she leave C.why had she left D.why she had left
I couldn't understand（ ） the baby alone.
A.why she left B.why did she leave C.why had she left
D.why she had left

I couldn't understand（ ） the baby alone.A.why she left B.why did she leave C.why had she left D.why she had left
A、 D正确
从句后要用陈述语序
B、C后都不是
D 表示的是过去完成时 （had+动词过去分词）

应该选B

选A

D

A正确

a，why 引导从句，陈述句式

A