By the 1920s, Howard Carter an explorer.A．has become B．had become C．became D．would become 题目和参考答案——青夏教育精英家教网—

By the 1920s, Howard Carter ____ an explorer.

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

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。

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