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 $
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
答案是D, 我选E, 后来我想charging 根基平行原则的确不妥,但请问D的这种省略主语的表达有什么根据吗?谢谢各位
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