求教，prep 74，请大家帮忙。

qwedcxzas

还是不明白

为什么E 的
            and by前要加逗号
            明明就跟不远处的by平行而已

而且prep里不是常出现因为加了逗号而必须跟主句平行的错误吗?

还有为什么D的by an average … to almost $24000 less 要平行

我以为是

by an average of (nearly $8,000 a year
            at the start
            of their
            careers
            to
            almost
            $24,000)
        less

to是从8000到24000的意思啊

虽然那个less看起来是有点碍眼

但是和E选的
            ,and by比起来

哪个错的比较多啊??

qwedcxzas

顶~~~

另外还有这题

干麻在but前加逗号呢?

这样不会造成和主句平行的歧义吗?

虽然后面的部分和hundreds of…很平行

那何必多此一举加了逗号,反而会造歧义呢?

138.  (32057-!-item-!-188;#058&006635)

 

A middleweight black hole weighs in at roughly 500 solar masses, hundreds of times more massive than the lightweight black holes produced by the collapse of individual stars, but
            thousands or even millions of times less in its mass as the heavyweight giants that lurk in the centers of galaxies.

 

(A) thousands or even millions of times less in its mass as

(B) it is thousands or even millions of times less massive as

(C) thousands or even millions of times less massive than

(D) yet it is thousands or even millions times less massive than

(E) yet it is thousands or even millions of times less in its mass than