_____ new cure for this disease that medical experts have recently developed proves to be ______ most effective, although it can not completely kill all the viruses.

A. A; a        B. The; /             C. /; the                   D. A; the

 _____ new cure for this disease that medical experts have recently developed proves to be ______ most effective, although it can not completely kill all the viruses.

A. A; a        B. The; /             C. /; the                   D. A; the

 _____ new cure for this disease that medical experts have recently developed proves to be ______ most effective, although it can not completely kill all the viruses.

A. A; a        B. The; /             C. /; the                   D. A; the

 _____ new cure for this disease that medical experts have recently developed proves to be ______ most effective, although it can not completely kill all the viruses.

A. A; a        B. The; /             C. /; the                   D. A; the

 _____ new cure for this disease that medical experts have recently developed proves to be ______ most effective, although it can not completely kill all the viruses.

A. A; a        B. The; /             C. /; the                   D. A; the