几道专四的语法题,在线等

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 trained2,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