Staff are supposed to report for ____ at the normal place of work.
A. constraint
B. responsibility
C. obligation
D. duty
查看答案
You can't move in right now. The house______.
A. has painted
B. is painted
C. is being painted
D. is painting
This problem is beyond his ability and he can not ________ it.
A. slip
B. pack
C. gain
D. solve
It's difficult for us to learn a lesson in life____we've actually had that lesson.
A. until
B. after
C. when
D. since
For many cities in the world, there's no room to spread out further,__ New York is an example.
A. for which
B. in which
C. of which
D. from which