—Was it in April, 1970          China succeeded              sending its first satellite into space?

       —Yes, that’s right.

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

---Was it in April, 1970______China succeeded______sending its first satellite into space?
---Yes, that’s right.

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

—Was it in April, 1970          China succeeded              sending its first satellite into space?

       —Yes, that’s right.

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