问题

You look worried. What’s your________—I have trouble learning English.
A: mustn’t
B: couldn’t
C:can’t
D:might
B: couldn’t
C:can’t
D:might
正确答案是:
同类题型
Tommy ,don’t play a joke _____ the little boy , he is very shy
Coffee, which is becoming more and more popular, was first grown in _______ is now part of Brazil.
Will William make his dream come true–___________ . He isn’t working hard enough.
He didn’t get a satisfactory result_______, he failed [ ]
There _____ some flowers in front of our classroom next year.