This is ______I wanted.A the one what B which C one which D the oneThis is ______I wanted.A the one what B which C one which D the one请高手顺便讲一下为什么 授人以鱼不如授之以渔啦 5.Oxford,as we know,_____is one of the best universities in the worldA that B / C it D this

1.D。the one可以省略that，这样先行词和引导词就都有了。
如果选A，应该是the one which/that. B少了先行词.C少了定冠词
2.B。去掉插入语as we know，主语Oxford有了。谓语is也有了，中间不需要插入别的冠词或主语

D 是正确答案，：This is _the one (先行词)_用（that）____I wanted,因为是做宾语，所以省略了that.

5,as we know是插入语，和后面的谓语动词没关系的。所以用B 不填。

希望对你有用。

1.D the one
完整的是 This is the one that I wanted
先行词是the one 后面是由that 引导的定语从句,修饰the one
而that在定语从句中,是充当want的宾语,是宾语成分,可以省略掉,所以就变成 this is the one I wanted
如果用A,应该是 This is what I wanted.what引导的一个表语从句
5.B /
as we know,I think,to be honest 等很多词组都是插入语,它们对原来的句子没有影响
这里as we know是插入语,可以把它忽略掉,那剩下的就是 Oxford is one of the best.这是一个完整句子了.