myuniversityliesinthenorthofthecity,aroundwhicharehighmountains.为什么是whichare而不是whichis

Question

my university lies in the north of the city,around which are high mountains.
为什么是which are 而不是which is

Answer 1

Are 对应high mountains,是复数，所以用are而不是is。Around which指＂环绕大学的＂，are high mountains 指＂是高高的群山＂。