【课堂笔记】2022中石油托福全程班-语法笔记39

跟着大师兄学语法，不迷路。大师兄带着大家一起探究语法的奥秘。今天我们详细讲解五道题。

(2)Total color blindness, _______ isthe result of a defect in the retina.

A. a rare condition that

B. a rare condition

C. that a rare condition

D. is a rare condition

答案：B.逗号之外是完整的句子，空格在主语之后一般是同位语，定语，状语或非限定性定语从句。AC含从句引导词，但没有谓语动词，D有谓语动词，但没有从句引导词，均排除。B为名词短语做同位语，故选B。

(3)_________no conclusive evidence exists, many expertsbelievethat the wheel was invented only once and then diffused to the rest of the world.

A. Even

B. But

C. Although  

D. So

答案：C.标黄部分为主语，标绿部分为谓语，标蓝部分为宾语从句，逗号前应是从句，ABD都不能引导从句，even是副词，but是并列连词，D是副词，故选C.

(4)Wherever there is plenty of rain during the growing season, lifeis ________ in various forms.

A. abundant

B. the abundance

C. an abundant

D. it abundant

答案：A.标黄部分为状语从句，标绿部分为主语，标蓝部分为谓语，逗号后面是主句，is是系动词，空格处应是表语。C缺名词做中心词，D多it,排除。根据题意应选A。

(5)In her time, Isadora Duncanwas ________ today a liberated woman.

A. calling what we would

B. who would be calling

C. what we would call

D. she would call it

答案：C. was是句子谓语，四个选项里都有动词，所以空格处应是从句的引导词和从句主谓语，排除AD。空格前没有指人的先行词，排除B. C是宾语从句。