It was the training ____ he had as a young man ____ made him such a good engineer.

It was the training ____ he had as a young man ____ made him such a good engineer.

A．what; that                             B．which; that

C．that; which                            D．that; what

It was the training _____ he had as a young man _____ made him such a good engineer.

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

It was the training _____ he had as a young man _____ made him such a good engineer.

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

It was the training        he had as a young man        made him such a good engineer．

1. A.
   what；that
2. B.
   which；that
3. C.
   that；which
4. D.
   that；what