og12-41 og12-59 og12-95

41.To develop more accurate population forecasts, demographers have to know a grea deal more than now about the social and economic determinants of fertility.

A    have to know a grea deal more than now about the social and economic

D    would have to know a great deal more than they do now about the social and economic

正确选D 但我认为A 中的they do 是可以省略的，因为他的主谓都一样啊，请同学们帮我看看

59.The Olympic Games helped to keep peace among the pugnacious states of the Greek world in that a sacred truce was proclaimed during the festival's month.

A   world in that a sacred truce was proclaimed during the festival's month.

D  world, for a sacred truce was proclaimed during the month of the festival.

正确选D  我选正确的，但不知道A是怎么错的，in that 也能表示原因阿，不是错在the festival's month上面了吧。。。。

95.The peaks of a pountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flow pattern, with crests and troughs that remain stationary although the air that forms them is moving rapidly, are known as "standing waves".

A  crests and troughs that remain stationary although the air that forms them is moving rapidly, are

E  stationary crests and troughs athough they are formed by rapidly moving air,is

这题我一战的时候就没有想明白，GMAT不是要求简洁么，名词后面接上that +形容词不如形容词+名词来的更复杂？请同学看看吧。。。弄死想不通

41。A和D最大的区别就在于时态  你仔细看 D是不是多了一个would 这个是将来时态

任何时态的使用的考点（考查点）在原文都一定会有对应 所以看到时态区分问题一定要回归原句 找标志

这题的标志就是forecasts 表预测 所以用将来时态更合适

59.确实问题在the festival's month上 无生命的一般使用n of n形式 A不是不对 是不如D好 D选项的表达更清晰

95.LZ贴错了吧 这题选C 主谓一致就可以马上排除剩下C和E

E错在用了被动形式 使动作发出者丧失 所以相对而言C主动形式更好

非常感谢LS的回答,最后那道的确是贴错了,正确答案是

C creats and troughs that remain stationary although  the air that forms them is moving rapidly, is

以上都明白了，不过还有同学来说明下 in that 的用法么？

in that 固定用法，引导原因状语从句。意思为：原因在于，由于，既然

其实和because用法相同 都是介词 后面要接句子