who helped Mum wash the dishes yesterday?Helen().A.washed B.helped C.did D.was

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whohelpedMumwashthedishesyesterday?Helen().A.washedB.helpedC.didD.waswhohelpedMumwashthedishesyester

who helped Mum wash the dishes yesterday?Helen().A.washed B.helped C.did D.was
who helped Mum wash the dishes yesterday?Helen().A.washed B.helped C.did D.was

who helped Mum wash the dishes yesterday?Helen().A.washed B.helped C.did D.was
C
did即helped.但选B有重复之嫌.英语讨厌重复.
更上一层楼!

C.did
did是助动词,代替前文的helped
不能选B,因为helped时及物动词,后面没有宾语。

who helped Mum wash the dishes yesterday?
Helen().
A.washed B.helped C.did D.was

C