一道语法题

xianwhartons

Q8:
A new hair-growing drug is being sold for three times the price, per milligram, as the drug’s maker charges for another product with the same active ingredient.

A.        as
B.        than
C.        that
D.        of what
E.        at which
   Answer:

请问大家一下,道题为什么选D呢?感觉"of what"和charge搭配不对啊.谢谢~

新月

句子有点儿怪怪的。。。
Anyway, answer your question. " of what"不是和charge搭配的，应该看成the price of / what the

drug's maker charges for/ another product...  这里的what 和of不是联合起来看，of要修饰的是

the price 的所属关系；what要修饰的是the drup maker的“做”的这个行为.