The operation turned out to be very successful,_______ was m

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The operation turned out to be very successful,_______ was more than we could expect.
A.which
B.what
我认为A.B都可以的,既可以作非限制性定语从句,也可以作主语从句
那么我哪里想错了?非限制性定语从句和主语从句又如何区分?

1.正确答案是A,而B是错误的.
2.楼主也许是记错了,what是不能做关系词用来引导定语从句的,非限制性定语从句也不行.
提醒：as是可以的,而且也可作为此题的正确答案.
as和which都可以做关系代词,代替整个主句来充当非限制性定语从句的某个成分.只不过which引导的从句只能放在句尾而已.
3.非限制性定语从句和主语从句的区别：
1）顾名思义,非限制性定语从句是定语从句中的一种,它在主句中充当的是定义的作用,用来修饰主句中某个代词或名词(短语)而已,也可称之为形容词型从句.
如：I,who am a teacher,would like to help every student.
who am a teacher只是做主句主语I的定语.
2）而主语从句属于名词性从句,是拿整个句子来充当主句的主语,也就是像一个名词(短语)一样去做句子的主语.
如：How old she is is a secret.=Her age is a secret.
例句中的主语从句how old she is其实就相当于后句中的名词短语her age.

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