Distinct 3 columns and 4th column with sum [closed]

how can I select in a Oracle DB all columns but some of them DISTINCT.
I have columns A,B,C that I want distinct and column D that I want the sum of the rows.

A   B   C   D
1   2   3   10
1   2   3   20
1   2   4   1000

And I want the result

A   B   C   D
1   2   3   30
1   2   4   1000

Thanks!