My English is very poor.I must _(do) my best.怎么填

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MyEnglishisverypoor.Imust_(do)mybest.怎么填MyEnglishisverypoor.Imust_(do)mybest.怎么填MyEnglishisverypoor.

My English is very poor.I must _(do) my best.怎么填
My English is very poor.I must _(do) my best.怎么填

My English is very poor.I must _(do) my best.怎么填
must 动词原型!很标准的用法!记住就行了!答案是,do

do
must 情态动词后接动词原形