A:___you __ a letter B :Yes ,I have ___a letter to my mum .A Did ,write,wrote B Do,write,wrote

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A:___you__aletterB:Yes,Ihave___alettertomymum.ADid,write,wroteBDo,write,wroteA:___you__aletterB:Yes,

A:___you __ a letter B :Yes ,I have ___a letter to my mum .A Did ,write,wrote B Do,write,wrote
A:___you __ a letter B :Yes ,I have ___a letter to my mum .A Did ,write,wrote B Do,write,wrote

A:___you __ a letter B :Yes ,I have ___a letter to my mum .A Did ,write,wrote B Do,write,wrote
A A:Did you write a letter B :Yes ,I have wrote a letter to my mum .用did表明是过去式,助动词后用原形,所以是write,第二句没有助动词,所以用write的过去式wrote.

A:_Did__you _write_ a letter ?
B :Yes , I have _written_a letter to my mum .
才是正确文法