问题
They went to the Great Wall ______ vacation last year.[ ]
A: at
B: on
C: to
D:in
B: on
C: to
D:in
正确答案是：
同类题型
__________ do you watch TV?—Sometimes.[ ]
The girl was born __ the morning of May 1,1991.[ ]
I have more paper clips than_______, but my CDs are fewer than________.
The light is still on in his room. Do you know ?— Maybe he has to study for a test.
_______ of the students will take part in the sports meeting.