(A) being a recurring symbol within
(B) a symbol having recurred within
(C) a recurring symbol in
(D) having been a symbol that recurred in
(E) recurring as it is, a symbol in
Solution:
Wordiness/awkwardness
In A and D, use of being/ having been makes the choice wordy.
B and E changes the meaning. They suggest a symbol that recurred in past and not now anymore.
C is the best choice. It is concise.
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