选A
宾语从句中,由疑问词who/what/where/when...引导,句子后面保持陈述句语序
于是就是who+谓语+宾语
谓语就是did,宾语就是it
翻译：【他们不知道这事谁干的】
希望帮到你,满意敬请采纳,O(∩_∩)O谢谢~~
They don't know _______________ A. who did it B. who did it do C. who did do it D.who it did
They don't know _______________ A. who did it B. who did it do C. who did do it D.who it did
?kuai!
?kuai!
英语人气：575 ℃时间：2020-03-29 12:55:44
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