According to a 1996 survey by the National Association of College an 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
D) as charge
E) as those charging
Use "as" to introduce a clasue
如用D, as+S+V (主詞和前面相同所以被省掉)
用E, as many X charge ..under $8,000 as those charging over $16,000(當participle phr. modifies those)
我覺得這裡是在比較 as many X as Y 比較X,Y 誰比誰多
不是比較誰charge比較多
嗯 所以我仍偏於選(E)