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24-20 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
24-21 Nobody knows exactly how many languages there are in the world, partly because of the difficulty (of? ) distinguishing between a language and the sub-languages or dialects within it, but those who have tried to count typically have found about five thousand.
A) and the sub-languages or dialects within it, but those who have tried to count typically have found
B) and the sub-languages or dialects within them, with those who have tried counting typically finding
C) and the sub-languages or dialects within it, but those who have tried counting it typically find
D) or the sub-languages or dialects within them, but those who tried to count them typically found
E) or the sub-languages or dialects within them, with those who have tried to count typically finding
20的答案是e，为什么不选d？charge这里是什么成分？
21的答案是a，哪位nn帮助分析一下这里it指什么？为什么要用have tried?
谢谢先。  | 
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发表于 2004-12-9 01:33:00
