A． half not as much as B． much not as half as

C． not half as much as D． as much as not half

【答案】C

【解析】句意：太便宜了！这条裙子的价钱还不到衬衫价钱的一半。as．．as的否定式为not as/so +adj．/ adv．+as。故选C。