In California, a lack of genetic variation in the Argentine ant has allowed the species to spread widely; due to their being so genetically similar to one another, the ants consider all their fellows to be a close relative and thus do not engage in the kind of fierce intercolony struggles that limits the spread of this species in its native Argentina.

A.     due to their being so genetically similar to one another, the ants consider

all their fellows to be a close relative and thus do not engage in the kind

of fierce intercolony struggles that limits.

B.     Due to its being so genetically similar the ant considers all its fellows to be

a close relative and thus does not engage in the kind of fierce intercolnny

struggles that limit.

C.     Because it is so genetically similar, the ant considers all its fellows to be

 close relatives and thus does not engage in the kind of fierce intercolony

 struggles that limits.

D.     Because they are so genetically similar to one another, the ants consider

all their fellows to be close relatives and thus do not engage in the kind

of fierce intercolony struggles that limit.

E.      Because of being so genetically similar to one another, the ants consider

all their fellows to be a close relative and thus do not engage in the kind

of fierce intercolony struggles that limits.

我怎么觉得B 对呢？

A,B,E肯定是错的，因为做原因时，Because > Because of > Due to, 所以只能在C和D中选择。

C和D的不同还有最后limit的单复数问题，我觉得limit的主语还应该是前面的struggles,

因为kind of+主语，谓语单复数由主语的单复数定，所以应该选择D

该题为ETS典型的 because \ because of \due to 的考题。OG175有参考解释。另：

duo to 和because of 一般情况不作为正确的选项，而且ETS 用 because of one's

doing 来作为干扰选项。

   此类题正确的现场作题思路是：先排除含due to 及because of 等的选项，直接看

because 从句的选项，如正确，则其它选项可略去不看。现场分秒必争啊！