請問than後面的省略

[lovekyoko]

75.In a recent poll, 86 percent of the public favored a Clean Air Act as strong or stronger than the present act.
(A)a Clean Air Act as strong or stronger than
(B)a Clean Air Act that is stronger, or at least so strong as,
(C)at least as strong a Clean Air Act as is
(D)a Clean Air Act as strong or stronger than is
(E)a Clean Air Act at least as strong as


想請大家比較一下OG(VR)75和73

73.. Analysts blamed May's sluggish retail sales on unexciting merchandise as well as the weather, colder and wetter than was usual in some regions. which slowed sales of barbecue grills and lawn furniture.
(A)colder and wetter than was usual in some regions, which slowed
(B)which was colder and wetter than usual in some regions, slowing
(C)since it was colder and wetter than usually in some regions, which slowed
(D)being colder and wetter than usually in some regions, slowing
(E)having been colder and wetter than was usual in some regions and slowed

75題CD上面有人是說因為比較的是受詞互相比較而不是主詞所以is不用寫出來
所以是說a Clean Air Act & present act這2個在比較嗎???
但是OG解釋是說違反平行 所以我的看法是(C)的第2個is是連接詞但前面沒有is可以平行所以錯D選項一樣同C

那73題的A選項為啥was是不需要的

哪位牛人可以解一下比較一下這2題

[dibert8]

75.
(C) at least as strong a Clean Air Act as is
a Clean Air Act 名詞; is 動詞 => 不平衡
(E) 是的: a Clean Air Act & present act 這2個在比較

73.
(A) 時態相同,動詞應該省略