John found ____ difficult to pass the entrance examination空格应该填什么

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Johnfound____difficulttopasstheentranceexamination空格应该填什么Johnfound____difficulttopasstheentranceexam

John found ____ difficult to pass the entrance examination空格应该填什么
John found ____ difficult to pass the entrance examination空格应该填什么

John found ____ difficult to pass the entrance examination空格应该填什么
it 指示代词 it 指代后面的不定式 to pass the entrance examination

it
find it+adj.to do sth.固定句型,发现做某事是~

it
形式主语