The United States and Canada have agreed to joint action on acid rain, an environmental pollutant that each exports to the other.
(A) that each exports to the other
(B) each is exporting to the other one
(C) that one exports to the next
(D) they are exporting to one another
(E) that they both export to each other
(A) that each exports to the other
(B) each is exporting to the other one
(C) that one exports to the next
(D) they are exporting to one another
(E) that they both export to each other
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