请教几道题目

91.   Like many self-taught artists, Perle Hessing did not begin to paint until she was well into middle age.

(A) Like

(B) As have

(C) Just as with

(D) Just like（A）

(E) As did

OG91 要是主句只有一个助动词是不是要补出？有两个的时候可以不补出。

OG104The diet of the ordinary Greek in classical times was largely vegetarian—vegetables, fresh cheese, oatmeal, and meal cakes, and meat rarely.

(A) and meat rarely

(B) and meat was rare

(C) with meat as rare

(D) meat a rarity（E）

(E) with meat as a rarity

的解释谁能说明一下，没有看懂。

OG1181l8.  The question of whether to divest themselves of stock in companies that do business in South Africa is particularly troublesome for the nation’s 116 private Black colleges because their economic bases are often more fragile than most predominantly White colleges.

(A) than

(B) than those of

(C) than is so of

(D) compared to（B）

(E) compared to those of

为什么在AB中选择了B，B中加了THOSE OF ，一般都说有THOSE出现是指待错误。

OG120120. The Parthenon was a church from 1204 until 1456, when Athens was taken by General Mohammed the Conqueror, the Turkish sultan, who established a mosque in the building and used the Acropolis as a fortress.
(A) who established a mosque in the building and used the Acropolis as
(B) who, establishing a mosque in the building, used the Acropolis like
(C) who, when he had established a mosque in the building, used the Acropolis like
(D) who had established a mosque in the building, using the Acropolis to be
(E) establishing a mosque in the building and using the Acropolis as
为什么E错？

OG157中为什么选择被动的？不是在GMAT公理中主动优先于被动吗？

OG210210. Scientists have recently discovered what could be the largest and oldest living organism on Earth, a giant fungus that is an interwoven filigree of mushrooms and rootlike tentacles spawned by a single fertilized spore some 10,000 years ago and extending for more than 30 acres in the soil of a Michigan forest.
(A) extending
(B) extends
(C) extended
(D) it extended
(E) is extending
为什么不用C与SPAWNED都是过去时？而要选择现在时态？

OG214选项应该从哪个方向判断？怎么不知道如何下手？

OG220220. For almost a hundred years after having its beginning in 1788, England exiled some 160,000 criminals to Australia.
(A)For almost a hundred years after having its beginning in 1788,
(B)Beginning in 1788 for a period of a hundred years,
(C)Beginning a period of almost a hundred years, in 1788
(D)During a hundred years, a period beginning in 1788,
(E)Over a period of a hundred years beginning in 1788,
如何选择？

OG229229. The colorization of black-and-white films by

computers is defended by those who own the film rights, for the process can mean increased revenues for them; many others in the film industry, however, contend that the technique degrades major works of art, which they liken to putting lipstick on a Greek statue.which they liken to putting lipstick on a Greek statue
which they liken to a Greek statue with lipstick put on it
which they liken to lipstick put on a Greek statue
likening it to a Greek statue with lipstick put on it
likening it to putting lipstick on a Greek statue
出现WHICH和表示伴随的DOING应该怎么选择？

急问

你可以将题目分开来问吗？那样会更好回答。