he is one of the students who,I am sure,always do_____best.

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he is one of the students who,I am sure,always do_____best.
he is one of the students who,I am sure,always do_____best.

he is one of the students who,I am sure,always do_____best.
their
who后面的从句修饰的是students,复数,所以用their

his

their

he is onw of the students who, i am sure, will always do the best

the