it is difficult to do /doingit is difficult 后接to do 还是doing

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it is difficult to do /doingit is difficult 后接to do 还是doing
it is difficult to do /doing
it is difficult 后接to do 还是doing

it is difficult to do /doingit is difficult 后接to do 还是doing
it is difficult/adj. to do sth.

固定短语,to do.楼主采纳下噢

接t0 do