问题

They do some exercises ______ Friday morning. [ ]
A: on
B: in
C: at
D:to
B: in
C: at
D:to
正确答案是:
同类题型
What has happened in your hometown?— Great changes _____ in my hometown recently.
Success will belong to those ___ never say impossible ..
You hate Jim,don’t you?—.I just think he is a bit annoying,that’s all.
If it doesn’t rain tomorrow, I_____fishing. [ ]
I have ________ useful knife and my sister has _______ eraser.