Recently discovered fossil remains strongly suggest that the Australian egg-lying mammals of today are a branch of the main stem of mammalian evolution ( rather than developing independently from) a common ancestor of mammals more than 220 million years ago.
(A)
(B) rather than a type that developed in dependently from
(C) rather than a type whose development was independent of
why the answer is B NOT C???作者: primefang 时间: 2002-10-3 23:04
从句意上虽然看不出设么区别,但是从并列的角度来看
B a branch 和 a type 并列
C a branch , 但是后面的重心变成了development,