The formerly ____ waters of the lake have been polluted so that the fish are no longer visible from the surface.
Solution:Option(D) is correct
The word ‘formerly’ indicates that once things were different.
So, since now the waters are polluted so that fish cannot be seen, then formerly they must have been unpolluted and clear (pellucid).
(tranquil = peaceful; stagnant = not moving; pellucid = transparently clear; rancid = stale)
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