_____in 1939,the Borne Bridge spans the Cape Cod Canal and is one of the many grand projects of the Depression era.A.Being completed B.CompletedC.Having been completed D.Having completed

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_____in 1939,the Borne Bridge spans the Cape Cod Canal and is one of the many grand projects of the Depression era.A.Being completed B.CompletedC.Having been completed D.Having completed
_____in 1939,the Borne Bridge spans the Cape Cod Canal and is one of the many grand projects of the Depression era.
A.Being completed B.Completed
C.Having been completed D.Having completed

_____in 1939,the Borne Bridge spans the Cape Cod Canal and is one of the many grand projects of the Depression era.A.Being completed B.CompletedC.Having been completed D.Having completed
B
由于有明确的表示过去的时间,故用一般式表示即可.A表进行,C,现在完成进行,D现在完成进行的主动,三者均不合适.