Little _ when I took the trip and _ did my brother.

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Little ___ when I took the trip and ___ did my brother.
A.have I known; so B.had I know;neither
C.do I know; so D.did I know; neither
如果把b项改成 had I known对还是错?had I know 和did I know的区别?

如果把b项改成 had I known还是错了.因为and前后的句子时态要统一.后面是did,前面就一定也要是did.
had I known是过去完成时,讲的是“过去的过去”的事情；did I know是一般过去时,讲的是“过去”的事情.
顺便说一下,这个句子是由否定词little提前而引起了部分倒装句.

Little ___ when I took the trip and ___ did my brother. My brother ___(join) the army when he ___ (be) 20 and he ___ When my brother ___(come) into the room,I ___(telephoto) Mar My brother ___(read) many books when I was young. My brother and l will go to the library tomorrow.So ___ I.Sh My brother and I like ___ (drink) coffee. -when ___ you ___ my brother?-last year. 1.when i took the chicken out from the fridge,my brother cam 37、My brother is very tall.The little bed won’t ___ for him. The animal is very_____(dager) My little brother is very ___ I like red but my brother ___. When did they have the meeting?"___"