sec01-21,问关于单复数平行

amber0919

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,
(B) The owner of a condominium apartment has free and clear title to the dwelling, but
(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
(E) Condominium apartment owners have a title to their dwelling that is free and clear, while

答案为C. 解释上说Choices A, B, and D can be faulted for comparing a single owner of a condominium with owners of cooperative apartments.  判为单复数不平行.但我在OG上确实有几题单复数不是严格平行的呀.比如OG167

80. Salt deposits and moisture threaten to destroy the Mohenjo-Daro excavation in Pakistan, the site of an ancient civilization that flourished at the same time as the civilizations in the Nile delta and the river valleys of the Tigris and Euphrates.
(A) that flourished at the same time as the civilizations
(B) that had flourished at the same time as had the civilizations
(C) that flourished at the same time those had
(D) flourishing at the same time as those did
(E) flourishing at the same time as those were

这题也不平行嘛.  

大家多多指教.

amber0919

ericxixi

GMAT本来就不是绝对正确的答案,平行对称单复数一致当然最好,你说的80题的问题在于those没有指代对象