求教一个被动语态的问题，谢谢！

landmark11

A Labor Department study states that the numbers of women employed outside the home grew by more than a thirty-five percent increase in the past decade and accounted for more than sixty-two percent of the total growth in the civilian work force.
(A) numbers of women employed outside the home grew by more than a thirty-five percent increase
(B) numbers of women employed outside the home grew more than thirty-five percent
(C) numbers of women employed outside the home were raised by more than thirty-five percent
(D) number of women employed outside the home increased by more than thirty-five percent （Correct）
(E) number of women employed outside the home was raised by more than a thirty-five percent increase

请教一个问题：

答案 D 中的 increased by 是被动语态的用法吗？ 如果是，为什么在 increased 前没有 Be 动词？

如果不是，那么“动词 + by + 数词 ”（increased by 35%）是不是一定要用在被动语态的结构中？印象中这种结构一般都出现在被动语态中，当 “什么物品被增加了35%” 讲。请大神指教指教这个结构的用法，谢谢！

landmark11

谢谢您的回复！

lainemai

我不是大神哦。
楼主说的increased by不是被动语态呀，increased by是指增加了多少。increase to是增加到多少
看下这个例句：Japan's industrial output increased by 2%... 日本工业产量增长了2%。
所以没有说increase by是一定要用在被动语态中的这样的说法~
OPEN TO DISCUSSION