She was too young to understand( )her family were so sad and would not take any notice of her.
A.正确答案Dwhen
B.what
C.whether
D.why
She was too young to understand( )her family were so sad and would not take any notice of her.
She was too young to understand( )her family were so sad and would not take any notice of her.
A.正确答案Dwhen
B.what
C.whether
D.why