Atlantis - Singular Subject
This narrows down the options to A,B and D.
D - incorrect use of continuous tense.
A - As "before" is present in the sentence, we should not use "had been.."
So, correct answer is B.
This narrows down the options to A,B and D.
D - incorrect use of continuous tense.
A - As "before" is present in the sentence, we should not use "had been.."
So, correct answer is B.



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