Some of the exercises appear to be ________ ones that you have done, but after taking     ________ second look, you will find that they are different．

         A．不填; the             B．the; the                 C．the; a                     D．the; 不填

Some of the exercises appear to be _____ones that you have done, but after taking ____second look, you will find that they are different.

   A. /, the                                  B. the, the                           C. the, a                                 D. /, a

Some of the exercises appear to be        ones that you have done, but after taking        second look, you will find that they are different.

A．不填; the  B．the; the     C．the; a D．the; 不填

Some of the exercises appear to be ___ ones that you have done, but after taking ___ second look, you will find that they are different.  

A. /; the          B. the; the      C. the; /       D. the; a

Some of the exercises appear to be _____ones that you have done, but after taking ____second look, you will find that they are different.

A. /, the 　　　　 　　B. the, the 　 C. the, a 　　 D. /, a