644.Since 1975 the number of women in upper-level management in American corporations have increased by 25 percent; female executives’ salaries, however, still lag behind those of their male counterparts. (A) have increased by 25 percent; female executives’ salaries, however, still lag (B) has increased by 25 percent, however much their salaries lag (C) have increased 25 percent; female executives’ salaries, however, still have lagged (D) has increased by 25 percent; female executives’ salaries, however, still lag (E) have increased 25 percent; their salaries, however, still lag
尽管这个题根据主谓一致和平衡对称原则,答案d最优,不过d中用一般现在时still lag不用现在完成时still have lagged的确不妥。
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