英语语法题（名词性丛句）

1.B 这就是河流被污染的过程.how 引导表语从句表示如何,在从句中做状语
2.C._what all the inventions have in common 主语从句,what 所...的,在主语从句中做宾语.
_that they have succeed 表语从句,他们都已经成功了.that 只起到连接作用在从句中不充当任何成分.
此句的意思是所有这些发明的共同点是他们都成功了

B/D

B B

This is the problem of relatibe clause pronoun.
Sentence 1.this is wheather the river was pollute.
In case of the situation, the word "wheather"is modifier. To tell others "the river was polluted".
If you fill in the blanket as "how", it means that "the river was polluted seriously."
If you are a high school student, I would like to suggest you to choose answer D.
Sentence 2.That all the inventions have in common is what they have succeed.
In fact, we can delete the word"that" in the begining of the sentence since "all the invention have in common is what they have succeed"to be a sentence. But in terms of "sentence structure", we always put "tha