I ____its mouth _____big .A.know,isn't B.don't know ,isn't C.don't knows ,is 哪个对.为什么呢?

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I ____its mouth _____big .A.know,isn't B.don't know ,isn't C.don't knows ,is 哪个对.为什么呢?

I ____its mouth _____big .A.know,isn't B.don't know ,isn't C.don't knows ,is 哪个对.为什么呢?
I ____its mouth _____big .A.know,isn't B.don't know ,isn't C.don't knows ,is 哪个对.为什么呢?

I ____its mouth _____big .A.know,isn't B.don't know ,isn't C.don't knows ,is 哪个对.为什么呢?
C.don't knows ,is 是正确的.
its mouth _is__big 是宾语从句.在这种主宾结构的句子中,通过主句的否定来否定全句的意思.
所以,从句不能用否定.所以,A,B均不对.

C 否定前移,不知对否

选C
考查否定前置,know,think等都是这个用法。
希望可以帮到你