The Changjiang River_____flows through Wuhan,is more than 3000 meters.A.that B.which C.as D.what 应选哪个?为什么?我也知道是定语从句，但是 先行词是物冠词代词 用that、which都可以吗？可是答案给的是B

The Changjiang River_____flows through Wuhan,is more than 3000 meters.A.that B.which C.as D.what 应选哪个?为什么?我也知道是定语从句，但是 先行词是物冠词代词 用that、which都可以吗？可是答案给的是B
The Changjiang River_____flows through Wuhan,is more than 3000 meters.
A.that B.which C.as D.what
应选哪个?为什么?
我也知道是定语从句，但是 先行词是物冠词代词 用that、which都可以吗？可是答案给的是B

The Changjiang River_____flows through Wuhan,is more than 3000 meters.A.that B.which C.as D.what 应选哪个?为什么?我也知道是定语从句，但是 先行词是物冠词代词 用that、which都可以吗？可是答案给的是B
as,which 非限定性定语从句
由as,which 引导的非限定性定语从句,as和which可代整个主句,相当于and this或and that.As一般放在句首,which在句中.
As we know,smoking is harmful to one's health.
The sun heats the earth,which is very important to us.
典型例题
1）Alice received an invitation from her boss,___came as a surprise.
A.it B.that C.which D.he
答案C.此为非限定性从句,不能用 that修饰,而用which.,it 和he 都使后句成为句子,两个独立的句子不能单以逗号连接.况且选he句意不通.
2）The weather turned out to be very good,___ was more than we could expect.
A.what B.which C.that D.it
答案B.which可代替句子,用于非限定性定语从句,而what不可.That 不能用于非限定性定语从句,it不为连词,使由逗号连接的两个句子并在一起在英语语法上行不通.
3）It rained hard yesterday,____ prevented me from going to the park..
A.that B.which C.as D.it
答案B.
as 和which在引导非限制性定语从句时,这两个关系代词都指主句所表达的整个意思,且在定语从句中都可以作主语和宾语.但不同之处主要有两点：
(1） as 引导的定语从句可置于句首,而which不可.
(2） as 代表前面的整个主句并在从句中作主语时,从句中的谓语必须是系动词；若为行为动词,则从句中的关系代词只能用which..
在本题中,prevent由于是行为动词,所以正确选项应为B.
As 的用法
例1.the same… as；such…as 中的as 是一种固定结构,和……一样…….
I have got into the same trouble as he (has).
例2.as可引导非限制性从句,常带有'正如'.
As we know,smoking is harmful to one's health.
As is know,smoking is harmful to one's health.
As是关系代词.例1中的as作know的宾语；例2中,它充当从句的主语,谓语动词know要用被动式.as ／which引导非限制性定语从句.
引导词as和which的区别在于：
①as引导的非限制性定语从句可放于主句前、主句中、主句后,而which引导的非限制性定语从句一般放于主句后或句中.as放在句首的情况常用的句式 有as we all know,as is mentioned above,而which我们则看不到这样用于句首的情况.
②as常与从句中的know,see,hear,expect等动词连用,也常用于as often happens,as is often the case（常有的事）等句子中；而which一般不用于以上情况.
③as有“正如”的含义,which没有此含义.如：
As is well known,Shanghai is a big city．
Some of the roads were flooded,which made our journey more difficult

B。长江是主语，逗号前的那部分是定语后置。前半句意思就是：流过武汉的长江。

B witch指代The Changjiang River，是就物体而言

AB都行，做后面定语从句的主语
我据觉得可能是空格前面有个逗号这个题目更好，那样就选B（非限制性）

A: 用that是辅助指定changjiang river, 因为整句句子都是在讲changjiang river
B: which前面需要加“，”用which的话感觉是“流经武汉”是长江的最大特征了，没有that来的合适
C: 1.as单独引导定语从句时，先行词可以是一个词，也可以是一个句子或短语。例如：(1) She is late, as is often the case....

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A: 用that是辅助指定changjiang river, 因为整句句子都是在讲changjiang river
B: which前面需要加“，”用which的话感觉是“流经武汉”是长江的最大特征了，没有that来的合适
C: 1.as单独引导定语从句时，先行词可以是一个词，也可以是一个句子或短语。例如：(1) She is late, as is often the case.她迟到了，这是经常的事。(先行词是整个主句)
(2) To shut your eyes to facts, as many of you do, is foolish.对事实视而不见--你们好多人都是如此的愚蠢。(先行词是不定式短语)
2.as作介词的用法
as作介词，意思是"作为"，"以……身份"。例如：
He came to China as a tourist five years ago.他五年前以游客的身份来过中国。
3.as作副词的用法
to the same degree or amount; equally "相同地"，"同样地"。例如：
They don”t have as many airplanes.他们没有同样多的飞机。
D. 比如：What he said was not nice; What are you going to do this weekend? 一般不在句中用于指代。
所以选择A

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B