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几道专四的语法题,在线等

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几道专四的语法题,在线等
答案,还有请告诉我为什么好吗,谢谢.急
1,No one can walk the wire without a bit of fear unless ____ very young.
A having been trained
B trained
C to be trained
D being trained
2,Having considered the problem for a while she thought better ___ her first
solution.
A of
B than
C from
D to
专四的问题是不能请教外国人的,因为外国人也会被误导.以下是我请教老美的结果,人家没有一道做对的...
第一道他选A,看了答案分析道:hmmmm, A only adds "having been" to the answer, making it past continuose tense... so i guess they think that trained is better, because it is past perfect tense, meaning that only after training will they be without fear. so b is best i suppose

第二道他选B,看了答案分析道:"of" works, but it means that she thought he first plan was better than someother plan that we don't know about. "than" means she thought of a new solution that is better than her first one (the only solution we are introduced to!) grrrrrr
问题是我现在需要一个应试的,Chinglish的答案.
btw,关于think better of,大家看看下面这个,what do u think? http://www.baidu.com/s?lm=0&si=&rn=10&ie=gb2312&ct=1048576&wd=think+better+of&tn=baidu
几道专四的语法题,在线等
A
有时间对比在内,实在走钢丝之前就训练,这样的时间对比又用在了分词作状语的情况,当然是A.有时过去,又是分词
A
think of = consider
better 是副词,well的比较结构
意思是:考虑了(这个问题)一会之后,他对敌一个方法考虑得更好了、