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
Can you work out the maths problem?— Sorry, I can ______ understand its meaning.
Oh! I came in a hurry and forgot to bring food.— It doesn’t matter, You can have______
I don’t think Lily can sing _______ Lucy.—I disagree. I think Lily can sing ______ Lucy.
On March 23, many people took part in “_________ Lights” activity to help save energy.