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
Have you been here before?— Yes. This is the third time that I ______ to Shanghai.
These young trees must ______.
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Some students are playing football. _______are doing their homework.
Helen, do you know if Martin _______ to my party next week?——I think he will come if he ______ free.