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21.   While the owner of a condominium apartment has free and clear title to the dwelling, owners of cooperative apartments have shares in a corporation that owns a building and leases apartments to them.

(A) While the owner of a condominium apartment has free and clear title to the dwelling,单复数不一致，the owners of condonminium apartment

(B) The owner of a condominium apartment has free and clear title to the dwelling, but没有转折，另同A

(C) Whereas owners of condominium apartments have free and clear title to their dwellings,

(D) An owner of a condominium apartment has free and clear title to the dwelling, whereas（C）同A

(E) Condominium apartment owners have a title to their dwelling that is free and clear, while繁冗

Choices A, B, and D can be faulted for comparing a single owner of a condominium with owners of cooperative apartments. (单复数不一致)In choice C, the best answer, the nouns agree in number. Nouns also agree in choice E, but one cannot tell whether the title or the dwelling is said to be free and clear. (简洁)This question is more difficult than the average.

固定用法：title to :the legal right to have or own something 这时，title是不可数名词

He has title to the land.

我感觉几个联词 whereas/ yet/while/but 意思和用法上表达可能不一样

有什么区别吗

谢谢

http://www.real-estate-for-sale.net/glossary/index.html

CONDOMINIUM OWNERSHIP - An estate in real property consisting of an individual interest in an apartment or commercial unit, and an undivided common interest in the common areas such as the land, parking areas, elevators, stairways, and the like.

COOPERATIVE OWNERSHIP - Cooperative ownership of an apartment unit means that the apartment owner has purchased shares in a corporation which holds title to the entire apartment building.