请教大全257

257. During an ice age, the buildup of ice at the poles and the drop in water levels near the equator speed up the Earth’s rotation, like a spinning figure skater whose speed increases when her arms are drawn in.

(A) like a spinning figure skater whose speed increases when her arms are drawn in

(B) like the increased speed of a figure skater when her arms are drawn in

(C) like a figure skater who increases speed while spinning with her arms drawn in

(D) just as a spinning figure skater who increases speed by drawing in her arms（E）

(E) just as a spinning figure skater increases speed by drawing in her arms

答案是E, 相比较其他选项，选E没太大问题，其他错误很明显。但就E，我想问：通常不是说as后面只能跟不完整句子吗？但E中as后面是个完整的句子呀？这个怎么解释呢？