試題詳解

20. Gasoline-powered, internal-combustion-engine-propelled vehicles had been around for more than a quarter-century by the start of the 1920s, but not until that decade they became a central factor in the everyday lives of ordinary Americans. Mass production, together with innovations in design, engineering, manufacture, and sales brought a new or used car, truck, or tractor within the reach of most people.
(A)had been
(B)a quarter-century
(C)they became
(D)brought
(E)reach of