By the end of last month,I___all the CDs of Justin Bieber

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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
我想答案是D,”过去的过去“但我只找到一个last month是过去的时间还有一个”过去“是哪个谁告诉我一下.顺便帮我翻译一下这个句子!

y表示"到.之前",last month已经是过去了,那么到last month之前就是过去的过去了
再问：那帮我翻译下句子可以吗....
再答：到上月底前,我就已经收集齐了JustnBieber的所有唱片

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