求教Prep一道sc

A new hair-growth drup is being sold three times the price, per milligram, as the drup's maker charges for another product with the same ingredient.

A. as,

B. than

C. that

D. of what

E. at which

Answer is C,

看那位NN帮忙解释一下,谢谢!

我不是NN，

愚见：

句意是three times the price that the drup's maker charges for another product

后面的that从句修饰前面的the price， 与前面的three times无关

另一例：

CEO's now earn 419 times the pay of blue-collar workers

请版主，NN们拍砖~

P.S这题前人应该讨论过，LZ可以搜搜