According to United States census data, while there was about one-third of mothers with young children working outside the home in 1975, in 2000, almost two-thirds of those mothers were employed outside the home. A. while there was about one-third of mothers with young children working outside the home in 1975, in 2000, almost two-thirds of those mothers were employed outside the home. B. there were about one-third of mothers with young children who worked outside the home in 1975; in 2000, almost two-thirds of those mothers were employed outside the home C. in 1975 about one-third of mothers with young children worked outside the home; in 2000, almost two-thirds of such mothers were employed outside the home D. even though in 1975 there were about one-third of mothers with young children who worked outside the home, almost two-thirds of such mothers were employed outside the home in 2000 E. with about one-third of mothers with young children working out- side the home in 1975, almost two-thirds of such mothers were employed outside the home in 2000
答案是C，我估计可能是出于平行的考虑，C确实是唯一在结构上平行的选择
但是对OG熟悉的朋友应该都记得，OG上有大量的题目，因为原选项遗漏了转折项而被为认定错误
在这里原选项包含了明显的转折意味，但是C中转折词被完全放弃了
而保留了转折词然而不够平行的D却被保留下来（D似乎没有其他语法错误，读起来也大致通顺）
这是不是意味着平行的意义要大于转折语义的保留？ | 
