i am the ifirst ___(know )about important news story

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i am the ifirst ___(know )about important news story
i am the ifirst ___(know )about important news story

i am the ifirst ___(know )about important news story
to know
the first/ second 后要接不定式,表示第几个做.事的人
如:
He was the first to reach the top of the mountain.

填 to know
序数词后常用不定式作定语

to know

to know