The problem is too difficult for him. He
题型:选择题
问题:
The problem is too difficult for him. He _______ solve it by himself without any help.
A.can't
B.mustn't
C.shouldn't
D.needn't
The problem is too difficult for him. He _______ solve it by himself without any help.
A.can't
B.mustn't
C.shouldn't
D.needn't