Source: Nova GMAT
Although World War II ended nearly a half century ago, Russia and Japan stillhave not signed a formal peace treaty; and both countries have been reticent to develop closer relations.
(A) have not signed a formal peace treaty; and both countries have been
(B) did not signed a formal peace treaty; and both countries have been
(C) have not signed a formal peace treaty; and both countries being
(D) have not signed a formal peace treaty; and both countries are
(E) are not signing
...
Although World War II ended nearly a half century ago, Russia and Japan stillhave not signed a formal peace treaty; and both countries have been reticent to develop closer relations.
(A) have not signed a formal peace treaty; and both countries have been
(B) did not signed a formal peace treaty; and both countries have been
(C) have not signed a formal peace treaty; and both countries being
(D) have not signed a formal peace treaty; and both countries are
(E) are not signing
...




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