大全 section d 15

cranberry

15. Madagascar was one of the last habitable areas of the earth to undergo human settlement, which has made it an ideal site for researching rare flora and fauna.
(A) Madagascar was one of the last habitable areas of the earth to undergo human settlement, which has made it
(B) Madagascar was one of the last habitable areas of the earth to have undergone human settlement, and that has made it
(C) Madagascar underwent human settlement as one of the last habitable areas of the earth, which makes it
(D) Madagascar, one of the last habitable areas of the earth, underwent human settlement, making it
(E) Because Madagascar was one of the last habitable areas of the earth to undergo human settlement, it is
E的时态很别扭，且it指代的是不是十分清楚呢？

rhod

E从句这里要么就是was, 要么就是is. 不可能是had been, 因为没有"过去的过去"的含义。如果是is的话，逻辑上好像不同，马达加斯加不可能现在是仅存的几个人类定居地，所以只能是was. 主句的一般现在时没有问题，表示一个现在的事实。

it指代应该是指Madagascar, 主从句的主语一致。

cranberry

thank you