GWD-24-19，望牛牛指导，感激不尽

christinaryt

A recently published report indicates that the salaries of teachers continue to lag far behind other college-educated professionals, because they make an average of nearly $8,000 a year less at the start of their careers and almost $24,000 less a year by the time they reach the age of 50.



A.other college-educated professionals, because they make an average of nearly $8,000 a year less at the start of their careers and almost $24,000 less

B.other college-educated professionals, by an average of nearly $8,000 a year at the start of their careers, to almost $24,000

C.what other college-educated professionals are paid—making an average of nearly $8,000 a year less at the start of their careers and almost $24,000 less

D.those of other college-educated professionals—by an average of nearly $8,000 a year at the start of their careers to almost $24,000 less

E.those of other college-educated professionals—by an average of nearly $8,000 a year at the start of their careers, and by almost $24,000

答案是E没有问题，但我不理解，为什么D错，看了就得prep解释为lag far behind 与less重复，我不明白破折号外的跟破折号里的为什么会算作语义重复，忘牛牛指点，感激不尽。

wyyavv

破折号看做逗号处理

hz032478

Parellism!!!

by 8000 a year....................... and by 24,000 at age of 50..

christinaryt

谢谢楼上的回答，我就从平行考虑吧，nearly $8,000 a year at the start of their careers, and by almost $24,000对于D，8000没有less那么24000也不能有less

hongnilvyi

E.those of other college-educated professionals—by an average of nearly $8,000 a year at the start of their careers(,) and by almost $24,000
为什么要加逗号呢 又不是句子的并列或者三个或三个以上的短语的并列
所以就直接选d了
求教丫