By the end of the last month Iall the CDs Of Justin Bieber.A. collectB. collectedC. have

问题补充：

By the end of the last month, Iall the CDs Of Justin Bieber.

A. collect

B. collected

C. have collected

D. had collected

答案：

A. collect

B. collected

C. have collected

(答案→)D. had collected

解析：这题考查时态：By the end of +过去时间，就用的是过去完成时，这是固定用法

句意是：到这月底为止，我已经收集所有Justin Bieber.的CD了选D。