It was 1969___ the American astronauts succeeded in landing on the moon.

It was 1969 _____ the American astronauts succeeded in landing on the moon.

   A. that            B. when           C. on which           D. which

It was 1969 ________ he was born．

1. A.
   that
2. B.
   in that
3. C.
   when
4. D.
   which