Despite them attempting to do it, doctors have not yet found a cure for the common cold.
(A) them attempting to do it
(B) their attempts to do so
(C) them attempting to do so
(D) the fact that they have attempted to do it
(E) their attempts to do it
(A) them attempting to do it
(B) their attempts to do so
(C) them attempting to do so
(D) the fact that they have attempted to do it
(E) their attempts to do it
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