Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and _______ which nothing can escape.

 Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and _______ which nothing can escape.

A．into; from                             B．towards; towards

C．out of; from                           D．through; through

Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and _______ which nothing can escape.

1. A.
   into; from
2. B.
   towards; towards
3. C.
   out of; from
4. D.
   through; through