问题

Tim is weak in math, so he is trying _________ up with other students now.
A:to catch
B:catch
C:catching
D:caught
B:catch
C:catching
D:caught
正确答案是:
同类题型
How long ________ you _______ the book ? — For only a week.
____ can I get to the post office?— Go down this street and turn left.
I have bought a Chinese – English dictionary? -When and where_____ you _____ it?
We get _______ sometimes when we study in a group. But we can learn from each other in this way.