i think it is important ___ us students to study hard at school.下划线那里应该填啥,为什么?

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i think it is important ___ us students to study hard at school.下划线那里应该填啥,为什么?
i think it is important ___ us students to study hard at school.下划线那里应该填啥,为什么?

i think it is important ___ us students to study hard at school.下划线那里应该填啥,为什么?
it is important for sb to do sth

for