he is one of the students who,I am sure,always do_____best.
问题描述:
he is one of the students who,I am sure,always do_____best.
答
their
答
he is onw of the students who, i am sure, will always do the best
答
the
答
his
答
their
who后面的从句修饰的是students,复数,所以用their