GWD 24-20 已经讨论了五年了，叹为观止……

sunny8843

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
    

A) than those that charge

    

B) than are charging

    

C) than to charge

    

D) as charge

    

E) as those charging

    

The key is E。

E我可以理解，但还是那个古老的问题，D为什么不对？可以看成是省略的形式啊……

msuzengli

因为主语不同啊.

charge 8000一年和charge 16000一年的学校可不是同一家啊~