The small children don't know_ A.what is their stockings in.B.what is in their stockings.

问题描述:

The small children don't know_ A.what is their stockings in.B.what is in their stockings.
C.where is their stockings in.
D.what is in their stockings.

The small children don't know_D.what is in their stockings.
D.what是从句的主语,语序是陈述语序