A subgroup of abelian torsion group with infinite exponent

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Take an abelian torsion group, with infinite exponent, say, G=C2+C4+C8+..+C2^k+.., where Cn is cyclic of order n. What is the subgroup S that is the intersection of all subgroups of G with infinite exponent? That seems to be characteristic in G, what does G/S look like? Would the answer be vastly different if G=C2+C3+C4+...+Cn+...?