253. 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
答案是B
og指出，A中有这样一个错误：usual前面的was应该省去。
我排除这个选项是觉得than usual是习惯用法，并没有觉得有什么语法错误。
再看下一个
266. In a recent poll, 82 percent of the public favored a Clean Air Act as strong or stronger than the present act.
C. at least as strong a Clean Air Act as is
E. a Clean Air Act at least as strong as
答案是E
当然E选项跟原句的中心更为接近。og认为C最后的is多余。
我在做的时候，认为at least as strong as the present act is. 恰恰是因为E没有is才排除了E。而且C选项的结构也是正确的。
这两道题的省略应该怎样解释呢？尤其是266题。
大侠们指教阿
谢过 | 
