问题
选择题
I'm sure you will do better in the test because you ____ so hard this year. [ ]
A. studied
B. had studied
C. will study
D. have been studying
答案
答案：D
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I'm sure you will do better in the test because you ____ so hard this year. [ ]
A. studied
B. had studied
C. will study
D. have been studying
答案：D