______ reaching the top of the mountain, a feeling of happiness and a sense of achievement will be experienced.

A. With         B. In         C. About       D. Upon

______ reaching the top of the mountain, a feeling of happiness and a sense of achievement will be experienced.

1. A.
   With
2. B.
   In
3. C.
   About
4. D.
   Upon

______ reaching the top of the mountain, a feeling of happiness and a sense of achievement will be experienced.

A. With         B. In         C. About       D. Upon

_______ reaching the top of the mountain, a feeling of happiness and a sense of achievement will be experienced．

A．With                B．In               C．About            D．Upon

______ reaching the top of the mountain, a feeling of happiness and a sense of achievement will be experienced.