it is important for us_____ english well 1.to learn 2.learning 3.learns 4.learned

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itisimportantforus_____englishwell1.tolearn2.learning3.learns4.learneditisimportantforus_____english

it is important for us_____ english well 1.to learn 2.learning 3.learns 4.learned
it is important for us_____ english well 1.to learn 2.learning 3.learns 4.learned

it is important for us_____ english well 1.to learn 2.learning 3.learns 4.learned

to learn 

这是固定句型It is adj.for sb.to do sth.