备考GRE的同学帮忙看下这道题选什么呢？

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ln medieval China, the Confucian emphasis on rites as an outward manifestation of virtueexplains Chinese bureaucrats_the accurate performance of tributary rituals byforeigners at the imperial court.

ambivalence toward
preoccupation with
proficiency with
obsession with
regard for
anticipation of

Select two answer choices.