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。