GMAT语法课堂分享，在核心主语前面，句子谓语动应当使用单数形式；若当each在复数核心主语后面时，则句子谓语动词应该使用复数形式。
8. Scientists say that each of thephotographs taken of the Ares Vallis plain by the Mars Pathfinder indicatethe overwhelming extent to flooding on the planet billions of years ago and thedegree that rocks were scattered by its force.
(A) indicate the overwhelming extent toflooding on the planet billions of years ago and the degree that
(B) indicate that the extent of the floods onthe planet billions of years ago was overwhelming and the degree to which
(C) indicate the overwhelming extent of thefloods on the planet billions of years ago and the degree to which
(D) indicates the overwhelming extent of theflooding on the planet billions of years ago and the degree to which
(E) indicates the overwhelming extent toflooding on the planet billions of years ago and the degree that
答案：D
解析：
8. Scientists say that each of the photographs takenof the Ares Vallis plain by the Mars Pathfinder indicate the overwhelming extent to flooding onthe planet billions of years ago and the degree that rocks were scattered by its force.
(A) indicate the overwhelming extent to flooding on the planet billions of years ago and the degree that
(B) indicate thatthe extent of the floods on the planet billions of years ago was overwhelmingand the degree to which
(C) indicate the overwhelming extent of the floods on the planetbillions of years ago and the degree to which
(D) indicates the overwhelming extent of theflooding on the planet billions of years ago and the degree to which
(E) indicates the overwhelming extent to flooding on the planetbillions of years ago and thedegree that

考场选项排除：
1. 谓语动词indicate划线，首先确定句子主谓是否一致，句子主语是each of，所以谓语动词应该使用单数形式，排除ABC。
2. 比较选项DE，可明显发现选项E中的并列成分to flooding与the degree that形式不对称，排除E。
考场选项排除：
A. 主谓不一致，句子主语是each of，所以其谓语动词应该使用单数形式，indicate应改成indicates；extent to flooding搭配不符合习惯，正确的搭配应该是extent of；同时the degreethat搭配也不符合习惯，正确的用法应该是the degree to sth.；并列成分to flooding与the degree that形式不对称。
B. 主谓不一致，indicate应改成indicates；and前后的并列成分形式不对称，and前是个独立的句子，and后却是个名词结构。
C. 主谓不一致，应将indicate改成indicates。
D.correct。
E. extent toflooding搭配不符合习惯，正确的用法应该是extent of；同时the degreethat搭配也不符合习惯，正确的用法应该是the degree to sth.；并列成分to flooding与the degree that形式不对称。