The question is _________ . A.so hard fo
问题:
The question is _________ .
A.so hard for us to understand it
B.too hard for us to understand it
C.too hard for us to understand
D.so hard for us to understand
The question is _________ .
A.so hard for us to understand it
B.too hard for us to understand it
C.too hard for us to understand
D.so hard for us to understand