Question

By the 1920s, Howard Carter ____ an explorer.

A．has become	B．had become
C．became	D．would become

Answer 1

B

解析试题分析:句意：到二十世纪二十年代，霍华德·卡特已经成为了一名探险家。根据时间状语By the 1920s可知此句表示“过去的过去”，用过去完成时，选B。
考点：考查动词时态。