【请教】OG-12-128、OG-12-129 时态问题

nopoles

128. Australian embryologists have found evidence that
suggests that the elephant is descended from an
aquatic animal, and its trunk originally evolving as a
kind of snorkel.
(A) that suggests that the elephant is descended
from an aquatic animal, and its trunk originally
evolving
(B) that has suggested the elephant descended from
an aquatic animal, its trunk originally evolving
(C) suggesting that the elephant had descended
from an aquatic animal with its trunk originally
evolved
(D) to suggest that the elephant had descended
from an aquatic animal and its trunk originally
evolved
(E) to suggest that the elephant is descended from
an aquatic animal and that its trunk originally
evolved

正确答案是E

问题1：128中，为什么第一个时态用的是一般现在时？“大象从。。。。进化而来”是真理吗？

129. Cajuns speak a dialect brought to southern Louisiana
by the 4,000 Acadians who migrated there in 1755;
their language is basically seventeenth-century French
to which has been added English, Spanish, and Italian
words.
(A) to which has been added English, Spanish, and
Italian words
(B) added to which is English, Spanish, and Italian
words
(C) to which English, Spanish, and Italian words have
been added
(D) with English, Spanish, and Italian words having
been added to it
(E) and, in addition, English, Spanish, and Italian
words are added

正确答案是C

问题2：to which从句中的时态为什么是现在完成时？是从逻辑上判断的，还是因为原句没有提供可以修改时态的依据，所以沿用原句时态？

zsz_219

is descended from 。。。从。。演变过来。。。

kittyocathy

第二题是根据意思判断的，他们说的那种法语已经被加有English, Spanish, and Italian words了。