The doctor came up and asked me ______the day before.

A．what had I eaten

B．what I have eaten

C．what have I eaten

D．what I had eaten

下列关于否定的命题中，正确的有（）

A.否定是破坏现存事物的方面，因而是消极因素

B.否定就是纯粹的否定，它不包含肯定

C.在一定意义上，否定就是肯定

D.否定可以脱离肯定存在