For quite a few students, their teacher’s advice is more important than of their parents.

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A. one
(答案→)B. that
C. it
D. any
解析：句意：对于相当多的学生来说，他们老师的建议比他们父母的建议更重要。因为advice不可数，所以用this和that指代。their teacher’s advice相当于this advice，their parents’=their parents’ advice就被看作that advice。选B。