让我云里雾里的一道题：大全No.226

mmfoolish

各位牛人啊，偶真不懂为何正确答案是A?为何D不正确？A中as businesses 为何正确呢？难道不是like businesses? 还有，A中that 修饰dwellings,D中they refer to “cooperative apartment houses”,which is correct?  谢谢！！！

226. Cooperative apartment houses have the peculiar distinction of being dwellings that must also operate as businesses.>>

(A) of being dwellings that must also operate as businesses>>

(B) of dwellings that must also operate like business>>

(C) that they are dwellings that must operate like business>>

(D) that, as dwellings, they must also operate like businesses

(E) to be a dwelling that must also operate as a business>>