问题

You can watch TV ______, but you can’t watch it ______a long time.
A:one, at
B:one, for
C:first, for
D:first, at
B:one, for
C:first, for
D:first, at
正确答案是:
同类题型
It’s _______ to see so many places of _______ around the world in one day.
What’s your favorite subject -Art . _________makes me more exciting than it does.
Timmy often gets full marks in the exams, but he nevershows off. He is very ______.
The sports meeting will continue ________ it rains this afternoon.