Air traffic routes over the North Pole are currently used by only two or three planes a day, but it was found by a joint Canadian-Russian study to be both feasible as well as desirable if those routes are opened to thousands more commercial planes a year.


Air traffic routes over the North Pole are currently used by only two or three planes a day, but it was found by a joint Canadian-Russian study to be both feasible as well as desirable if those routes are opened to thousands more commercial planes a year.

Currently used by only two or three planes a day, a joint Canadian-Russian study has found that if air traffic routes over the North Pole are opened to thousands more commercial planes a year, it would be both feasible and desirable.

A joint Canadian-Russian study, finding it to be both feasible as well as desirable to open air traffic routes over the North Pole, which are currently used by only two or three planes a day, to thousands more commercial planes a year. 

Although air traffic routes over the North Pole are currently used by only two or three planes a day, a joint Canadian-Russian study has found that opening those routes to thousands more commercial planes a year is both feasible and desirable.

With air traffic routes over the North Pole currently used by only two or three planes a day, opening those routes to thousands more commercial planes a year has been found by a joint Canadian-Russian study as both feasible and desirable. 

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题目分析：

本题全划线，看似比较乱，但实则非常简单，只要将每个选项的成分找清，立刻可以找到答案。

选项分析：

A选项：首先，代词it的指代对象只能是单数名词，并列连词but身后的句子是被动语态，主动语序为：
a joint Canadian-Russian study found it to be both feasible as well as desirable.
在逻辑上，被发现是“可行的”且“令人满意的”应该是“每年开放这些航线给更多的飞机”这件事，而不是某个单数名词（代词只能指代名词，不能指代句子）。
其次，found不论是主动还是被动，宾语和宾语的补足语部分都不能用不定式短语，应该用从句或ing形式来表达，这点考查了不定式和从句的区别。由于find的约束力较弱，所以其宾语和宾语的补足语不能用不定式to be的形式。
再次，both…and…是固定搭配，不能用both…as well as…。

B选项：本选项句首的currently used by only two or three planes a day是一个过去分词短语，在句中必然是伴随状语，其逻辑主句和其所修饰的句子的主语相同，即，a joint Canadian-Russian study。但在逻辑上，“每天被2~3个飞机用”的应该是“航线”，而不是“研究”。
另外，代词it的指代对象有误同选项(A)。

C选项：本选项没有谓语动词；代词 it的指代对象有误同选项(A)；find的宾语补足语部分都不能用不定式短语错误同选项(A)；both…as well as…错误同选项(A)。

D选项：Correct. 本选项在语法和逻辑上均是正确的。

E选项：本选项句首的with短语是独立主格结构，这里没有任何问题。真正的错误出现在主句上，其主动语序为：
a joint Canadian-Russian study found opening those routes to thousands more commercial planes a year as both feasible and desirable.
find身后只能用宾语从句，不能用宾语+宾补的形式。这点类似于不定式和从句的区别，英语中通常允许在“宾语”和“宾补”间补上to be以突出两者的关系，例如：
(1) I put a book on the table.
(2) I put a book to be on the table.
这两个例句的语意基本相同。由于find的约束力较弱，所以身后不能用不定式短语的形式。

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