My grandfather is fond of talking about the good old days, ________ is often the case with old people.

   A. when                  B. as                     C. that                   D. what

My grandfather is fond of talking about the good old days, ________ is often the case with old people．

A．when         B．as            C．that            D．what

 ________ is often the case with old people, my grandfather is fond of talking about good old days.

A. Which                    B. That                     C. What             D. As