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
B:mustn't
C:shouldn't
D:needn't
正确答案是：
同类题型
Listening is just as ______ as speaking in language learning.
I like music, but I don’t like ______ music of this film.
The new road is much _______ than before. Six cars can pass it at the same time.
Hurry up! The filmfor ten minutes.
I don’t know if he __________ tomorrow . If he _______ here , I will call you .