They didn't know who___it Adesign Bis designing Cdesigned Dwas designed 请说明理由!

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Theydidn''tknowwho___itAdesignBisdesigningCdesignedDwasdesigned请说明理由!Theydidn''tknowwho___itAdesignBis

They didn't know who___it Adesign Bis designing Cdesigned Dwas designed 请说明理由!
They didn't know who___it Adesign Bis designing Cdesigned Dwas designed 请说明理由!

They didn't know who___it Adesign Bis designing Cdesigned Dwas designed 请说明理由!
C
如果选A,要用动词单数第三人称形式,因为这里的who没指定是谁,是单数的意味,所以动词要用单数第三人称,加上主句是过去式,从句一般不用现在时态,除非从句说明的是一个真理.所以B也不对,这里用现在进行时,更加错误.D语法有很大的问题,这里选D,意思是,他们不知道谁被设计它.多好笑,对吧!
所以选C,主句过去式,从句也用一般过去式.

C
宾语从句,主句是一般过去时(DIDN'T),从句要用相应的过去时,故排除A与B,根据句意是‘他们不知道谁设计它‘是主动结构,再排除D

C
主句didn't 是过去时,从句也要是过去的时态。排除A、B。
who 与design是主谓关系,排除D。