Question

David studied hard before the examination, and it ______. He made an

1. A.
   A. worked out
2. B.
   marked out
3. C.
   paid off
4. D.
   got through

Answer 1

C
考查短语。据句意it代指戴维考前努力学习，他获得A，应是努力得到回报，所以选C,pay off意为回报。