问题

As students, we ________ study hard to make our country more beautiful and stronger.
A:should
B:may
C:can
D:could
B:may
C:can
D:could
正确答案是:
同类题型
Lucy felt on top of the world when she received the birthday present.
School starts at ______ nine o’clock.[ ]
Are these postcards ________, Millie? —Yes, they are____________.
We don’t like people _______ talk too much but never do anything. [ ]
Is John coming by train? —He should, but he ________ not. He likes driving his car.