prep-2-7,不解

Q19.So-called green taxes, which exact a price for the use of polluting or nonrenewable fuels, are having a positive effect on the environment and natural resource base of countries as varied as China, the Netherlands, and Hungary. C   A

(A) as varied as

(B) as varied as are

(C) as varied as those of

(D) that are as varied as

(E) that are varied as are

答案是 A，我选择C，这个到底是谁和谁在比较阿，我觉得those 是指代 base 的阿，请牛牛请教

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http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=343539&replyID=&skin=1

恩，我错了斑斑，我修改好了

和 country 比较