---Did you finish your homework on time yesterday.
---No, I didn't _______ on time. By the time I finished it, all my classmatesA.finish it; turned it inB.finish it; had turned in itC.make it; turned it inD.make it; had turned it in
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D解析make it表示“做到”，故第一空四个选项都正确。而后一空根据时间by the time I finished it表示的是到过去某个时候为止，应用过去完成时；同时rum in是“动词+副词”型短语动词，宾语为人称代词宾格it，应放在rum和in之间。