John's success has nothing to do with good luck. It is years of hard work _______has made him a great scientist today.

A. that         B. when         C. which          D. why

. John's success has nothing to do with good luck. It is years of hard work __________has made him what he is today.

     A. why            B. when           C. which           D. that

John's success has nothing to do with good luck. It is years of hard work      has made him what he is today.

A. why                         B. when                       C. which                      D. that

Super Lin Dan has become a world-famous badminton player. It is years of hard training and efforts, I think, _____ has made him ______he is today.

A．that; what         B．what; what         C．what; that         D．which; what

--What was the party like?

   --Wonderful. It is years_____________ I enjoyed myself so much.

A. that     B. since     C. when     D. before