问题
选择题
David studied hard before the examination, and it ______. He made an A.
A. worked out B. marked out C. paid off D. got through
答案
答案：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。
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