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标题: 关于这个题目，求nn [打印本页]

作者: mike125615212 时间: 2012-3-2 19:13
标题: 关于这个题目，求nn

A recently published report indicatesthat the salaries of teachers continue to lag far behind other

college-educatedprofessionals, because they make an average of nearly $8,000 a year less at the

start of their careers and almost $24,000less 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 andalmost $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

less at the start of their careers andalmost $24,000 less

(D) those of other college-educatedprofessionals--by an average of nearly $8,000 a year at the

start of their careers to almost $24,000less

(E) those of other college-educatedprofessionals--by an average of nearly $8,000 a year at the

start of their careers, and by almost$24,000

这个题正确答案是e但是，E为什么在, and by前加了个逗号呢？求解答啊求解答！！！

作者: mike125615212 时间: 2012-3-3 11:50

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