题目:
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.
选项:
A、than those that charge
B、than are charging
C、than to charge
D、as charge
E、as those charging
答案:
D