Scientists are trying to develop a special material, _______ they will make use of in space.

Scientists are trying to develop a special material, _______ they will make use of in space.

A. that             B.  what            C.  it           D. one

1.  Scientists are trying to develop a special material, _______ they will make use of in space.

A. it                B. that             C. what         D. one

Scientists are trying to develop a special material, _______ they will make use of in space.

1. A.
   that
2. B.
   what
3. C.
   it
4. D.
   one

Scientists are trying to develop a special material, _______ they will make use of in space.

A. it               B. that             C. what         D. one