一些语法问题，搞不清楚啊

那个新东方和石林语法什么的怎么讲的有些都是不一样啊。。。

那个石林语法说try to错，但是下面这道题？

1.SC大全补充题250中的31题：

31.It may someday be worthwhile to try to recover uranium from seawater, but at present this process is phohibitively expensive.

A. It may someday be worthwhile to try to recover uranium from seawater.

B.Someday, it may be worthwhile to try and recover uranium from seawater.

C.Trying to recover uranium out of seawater may someday be worthwhile.

D.To try for the recovery of uranium out of seawater may someday be worthwhile.

E.Recovering uranium from seawater may be worthwhile to try to do someday

我选的是D,因为考虑了不能用try to。可是答案是A。。。求解

2.还有那个adj.+n>n.+that is adj.吗？为什么下面这道题不是啊？

补充题中的33题

33.The spraying of pesticides can be carefully planned, but accidents, weather conditions that could not be forseen, and pilot errors often cause much larger deposits of spray than thet had anticipated.

A.weather conditions that could not be forseen, and pilot errors often cause much larger deposits of spray than they had.

B.weather conditions that cannot be foreseen, and pilot errors often cause much larger deposits of spray than.

C.unforeseeable weather conditions, and pilot errors are the cause of much larger deposits of spray than they had.

D.weather conditions that are not foreseeable, and pilot errors often cause much larger deposits of spray than.

E.unforeseeable weather conditions, and pilot errors often cause much larger deposits of spray than they had.

我选的是E。可是答案是B。为什么啊？

3.如果题目中出现的情态动词是perhaps,选项中出现may.是错的么？

4.read of 还是read about？

谢谢大家解答帮忙！

1.SC大全补充题250中的31题：

31.It may someday be worthwhile to try to recover uranium from seawater, but at present this process is phohibitively expensive.

A. It may someday be worthwhile to try to recover uranium from seawater.

B.Someday, it may be worthwhile to try and recover uranium from seawater.

C.Trying to recover uranium out of seawater may someday be worthwhile.

D.To try for the recovery of uranium out of seawater may someday be worthwhile.

E.Recovering uranium from seawater may be worthwhile to try to do someday

我选的是D,因为考虑了不能用try to。可是答案是A。。。求解

这里someday(at some times in the future)为副词,若放句首则改变句意所以B删

It虚主词放句首指代的是to recover动作

句意表述:从seawater recover uranium可能将来有一天是值得去尝试

Try to是错的????………PS我没看过这条规则…

至于D的错误:

1.有动词recover没必要用名词

2.犯了头重脚轻原则…ets还是偏爱小巧可爱的It做虚主词指代to的动作

Open to discuss…..

请问LS前辈

31题C的问题是？

31.It may someday be worthwhile to try to recover uranium from seawater, but at present this process is phohibitively expensive.

A. It may someday be worthwhile to try to recover uranium from seawater.

B.Someday, it may be worthwhile to try and recover uranium from seawater.

C.Trying to recover uranium out of seawater may someday be worthwhile.

D.To try for the recovery of uranium out of seawater may someday be worthwhile.

E.Recovering uranium from seawater may be worthwhile to try to do someday

我的理解：

1、C、D主语过长，应该用形式主语it来简化，然后用从句来详细阐述，这样的句子比较清楚

2、E里面最后的they指代不清

2.
            

they指代应该有歧义吧

另外,我在B跟D间犹豫,还是选了错误的D

是因为原句有could所以不能选D吗?

我看D有个foreseeable也带有可能的意思,所以选了他

可以指点一下D不优于B的理由吗?