og12 sc91 有关those 的问题

shenyueis007

91. Nobody knows exactly how many languages there are
in the world, partly because of the dif? culty of
distinguishing between a language and the
sublanguages or dialects within it, but those who have
tried to count typically have found about ?ve thousand.

(A) and the sublanguages or dialects within it, but
those who have tried to count typically have
found
(B) and the sublanguages or dialects within them,
with those who have tried counting typically
? n d i n g
(C) and the sublanguages or dialects within it, but
those who have tried counting it typically ?nd
(D) or the sublanguages or dialects within them, but
those who tried to count them typically found
(E) or the sublanguages or dialects within them,
with those who have tried to count typically ?nding

答案是A，
我想问的是，a中those是在指代这句话前面的那个部分，nobody吗？好像个人觉得不是。既然没有先行词，为什么可以在but后面直接用those而不是some people or somebody?求牛人指点

chloepc

我也想知道这个问题啊。。