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
(C) what other college-educatedprofessionals are paid--making an average of nearly $8,000 a year
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！！！ | 
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发表于 2012-3-2 19:13:04
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