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.ScientistssaythateachofthephotographstakenoftheAresVallisplainbytheMarsPathfinderindicatetheoverwhelmingextenttofloodingontheplanetbillionsofyearsagoandthedegreethatrockswerescatteredbyitsforce.

(A)indicatetheoverwhelmingextenttofloodingontheplanetbillionsofyearsagoandthedegreethat

(B)indicatethattheextentofthefloodsontheplanetbillionsofyearsagowasoverwhelmingandthedegreetowhich

(C)indicatetheoverwhelmingextentofthefloodsontheplanetbillionsofyearsagoandthedegreetowhich

(D)indicatestheoverwhelmingextentofthefloodingontheplanetbillionsofyearsagoandthedegreetowhich

(E)indicatestheoverwhelmingextenttofloodingontheplanetbillionsofyearsagoandthedegreethat

答案：D

解析：

8.ScientistssaythateachofthephotographstakenoftheAresVallisplainbytheMarsPathfinderindicatetheoverwhelmingextenttofloodingontheplanetbillionsofyearsagoandthedegreethatrockswerescatteredbyitsforce.

(A)indicatetheoverwhelmingextenttofloodingontheplanetbillionsofyearsagoandthedegreethat

(B)indicatethattheextentofthefloodsontheplanetbillionsofyearsagowasoverwhelmingandthedegreetowhich

(C)indicatetheoverwhelmingextentofthefloodsontheplanetbillionsofyearsagoandthedegreetowhich

(D)indicatestheoverwhelmingextentofthefloodingontheplanetbillionsofyearsagoandthedegreetowhich

(E)indicatestheoverwhelmingextenttofloodingontheplanetbillionsofyearsagoandthedegreethat

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eachof，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toflooding与thedegreethat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eachof，所以其谓语动词应该使用单数形式，indicate应改成indicates；extenttoflooding搭配不符合习惯，正确的搭配应该是extentof；同时thedegreethat搭配也不符合习惯，正确的用法应该是thedegreetosth.；并列成分toflooding与thedegreethat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.extenttoflooding搭配不符合习惯，正确的用法应该是extentof；同时thedegreethat搭配也不符合习惯，正确的用法应该是thedegreetosth.；并列成分toflooding与thedegreethat形式不对称。