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GWD语法题求助啊According to a 1996 survey by the National Associat

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GWD语法题求助啊
According to a 1996 survey by the National Association of College and University Business Officers,more than three times as many independent institutions of higher education charge tuition and fees of under $8,000 a year than those that charge over $16,000.
A.than those that charge
B.than are charging
C.than to charge
D.as charge
E.as those charging
但是D为什么不对,不是说as,than可以做比较从句的主语吗,
这边有一个用法,more than three times as…… as ,成分结构相同,前面是many insititutions,后面应为those 才统一对应