问题
选择题
By the end of last month, I _____ all the CDs of Justin Bieber. [ ]
A. collect
B. collected
C. have collected
D. had collected
答案
答案：D
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By the end of last month, I _____ all the CDs of Justin Bieber. [ ]
A. collect
B. collected
C. have collected
D. had collected
答案：D