133. (31827-!-item-!-188;#058&006534)
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
正确答案是E，可是我想问一下解释里面说less和lag behind是重复的，怎么解释啊？谢谢大家。
salaries are lag ,by $8000, behind those of other proffesionals
salaries are 8000 less than those of other proffesionals
see the problem?
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