i asked for something _ i konw they could not provide A.which B.as C.that D.whose

i asked for something _ i konw they could not provide A.which B.as C.that D.whose
i asked for something _ i konw they could not provide A.which B.as C.that D.whose

i asked for something _ i konw they could not provide A.which B.as C.that D.whose
应该选 C that
先行词 something 是不定代词,关系代词用 that ,不用 which .

选C 因为前面有不定代词something

C
考查定语从句，I know为插入语，可以去除。由于先行词为something, 故用关系代词that作为引导词。

选C，在从句的选择题中，that是通用的，只要有它，什么都不用想，就是它了！