The machines we use today are much better than ________ we used ten years ago．

1. A.
   them
2. B.
   these
3. C.
   they
4. D.
   those

The machines we use today are much better than ________-we used ten years ago．

1. A.
   those
2. B.
   ones
3. C.
   which
4. D.
   that

The machines we use today are much better than ____ we used ten years ago．

A．that          B．ones          C．the one          D．those