问题

Though this question is very difficult, if you ________ trying you will find the right answer.[ ]
A: keep up
B: keep on
C: keep out
D: keep off
B: keep on
C: keep out
D: keep off
正确答案是:
同类题型
I don’t think there is ________.
Why ______ you go to the zoo with us
It was a green dinner. _______———Thanks. But it really only took an hour.
We haven’t got many _______ for making cakes. Will you go and get some
s very clever and worthteaching , but her brother is not .Look ,he is now asleepin class .