885 sec 4-13

13.   According to scientists at the University of California, the pattern of changes that have occurred in human DNA over the millennia indicate the possibility that everyone alive today might be descended from a single female ancestor who lived in Africa sometime between 140,000 and 280,000 years ago.

(A) indicate the possibility that everyone alive today might be descended from a single female ancestor who

(B) indicate that everyone alive today might possibly be a descendant of a single female ancestor who had

(C) may indicate that everyone alive today has descended from a single female ancestor who had

(D) indicates that everyone alive today may be a descendant of a single female ancestor who（D）

(E) indicates that everyone alive today might be a descendant from a single female ancestor who

Ans，请问一下E错在那里啊？may跟might有什么差别，况且原题中是用might

谢谢！！

47, sec04-13

主语是the pattern谓语用单数indicates，排除A,B。C, had lived错，ago应该用lived. E,C的a descendant from错，应该是a descendant of

may与might在一定程度上是可以互换的。

看来我是没有考虑到descendant的用法，一直在may跟might之间做猜疑，这样清楚了！

感谢！！