问题
选择题
Since two months ago, many waste bottles_____ by the student in Class One. [ ]
A. collected
B. have collected
C. were collected
D. have been collected
答案
答案：D
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Since two months ago, many waste bottles_____ by the student in Class One. [ ]
A. collected
B. have collected
C. were collected
D. have been collected
答案：D