On the table she found a piece of paper _________some puzzling secret codes.

A.which was written                                         B.that was written

C.on which were written                                          D.on that were written

On the table she found a piece of paper ________ some puzzling secret codes.

1. A.
   which was written
2. B.
   that was written
3. C.
   on which were written
4. D.
   on that was written

On the table she found a piece of paper ________ some puzzling secret codes.

[　　]

On the table she found a piece of paper ________ some puzzling secret codes.

[　　]

On the table she found a piece of paper ________ some puzzling secret codes.

[　　]