I still remember ____ it was, he told me, ____ I could solve this kind of problems.

A. what ;that     B. how; that        C. what, what        D. when, who

I still remember ________ it was, he told me, ________ I could solve this kind of problems．

1. A.
   what ;that
2. B.
   how; that
3. C.
   what, what
4. D.
   when, who

I still remember ____ it was, he told me, ____ I could solve this kind of problems．

       A．what ;that           B．how; that      C．what, what     D．when, who

I still remember ____ it was, he told me, ____ I could solve this kind of problems．

       A．what ;that           B．how; that      C．what, what     D．when, who