I think you forgot to put space :-
this is your code:
B.Keyword4OR A.SelectedKeyword= B.Keyword5 OR A.SelectedKeyword = B.Keyword6OR A.SelectedKeyword = B.Keyword7"
check B.Keyword6OR, it should be written like B.Keyword6 OR .
here is updated code:
string Query ="SELECT DISTINCT B.CreatedDate
,B.JobTitle
,B.Location
FROM UserFeedSelection A
INNER JOIN JobForm B ON A.SelectedKeyword = B.Keyword1
OR A.SelectedKeyword = B.Keyword2
OR A.SelectedKeyword = B.Keyword3
OR A.SelectedKeyword = B.Keyword4
OR A.SelectedKeyword = B.Keyword5
OR A.SelectedKeyword = B.Keyword6
OR A.SelectedKeyword = B.Keyword7"
don't forget to put all given sting in one line or use Concatenation.
Good luck.