A.DnaAB.DnaBC.DnaCD.DnaG
A.DNA聚合酶IB.DNA聚合酶IIC.DNA聚合酶IIID.以上都可以
A.DNA 聚合酶IB.DNA 聚合酶IIC.DNA 聚合酶III 5′向3′外切功能D.DNA 聚合酶III 3′向5′外切功能