Tuition at a Chinese university runs -- 5000 yuan a year.

Tuition at a Chinese university runs __ 5000 yuan a year.
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Tuition at a Chinese university runs __ 5000 yuan a year.
A.so high as
B.as highly as
C.as high as
D.so highly as
哪个?说明下理由
as highly as 为什么不是这个 highly 副词 修饰动词run啊