The question below has blanks indicating that something has been omitted. Choose the set of word(s) that best fits the meaning of the sentence as a whole.
The discovery of ______ cave has ______ to the city’s history of subterranean structures.
another, added
As the very tone of the sentence is ‘exploratory’ starting with ‘The discovery of ‘, it should be have ‘another’ in the first blank followed by ‘added’ before ‘to the city’s history of subterranean structures’, in the second blank.