By the 1920s, Howard Carter ____ an explorer.

A. has become B. had become

C. became D. would become

 

B

【解析】

試題分析:句意：到二十世紀二十年代，霍華德·卡特已經(jīng)成為了一名探險家。根據(jù)時間狀語By the 1920s可知此句表示“過去的過去”，用過去完成時，選B。

考點：考查動詞時態(tài)。

 

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