SAT OG语法题

题目

SAT OG语法题
OG 892
5.In the wild,pygmy chimpanzees are found only in an inaccessible region south of the Zaire River, since such is the case,very few are in captivity.
 (A) since such is the case,very few are in captivity
  (B) and very few are in captivity because of that
 (C) no more than a few are in captivity as a result
(D) the number in captivity is very few for this reason
 (E) and so no more than a few are in captivity
A和C的错误在哪里?还有正确答案的E“and”和“so‘在一起不算介词连用么?
“and”和“so‘在一起不算连词连用么？还是说“and so”一起作为一个连词，可是字典说“and so”是个副词……

答案

这是网上的解释：
句子衔接.这是SAT语法句子改进部分常考的一类题目——句子衔接.典型的错误就是原句谓语数量过多（反过来说就是连词数量过少）,run-on problem.本题中排除A、C、D；剩下的B、E从翻译的角度上来说,含义相仿,差别在于B的because of that和E的so,很多同学可能觉得奇怪,and so可以连用吗?这不是两个连词吗?是不是redundant了?其实不然,and so本身就是一个连词,表示“因此”,既然如此,and so的表达方法就显然要比B的表述方法简洁的多.
我的个人解释是：
A后面是个完整的句子,与前句没有连词,中间应该是句号的.
C,no more than a few根本意思都变了,成了肯定的,和否定的very few是不一样的.
and so解释见上.