【題目】At college, Barack Obama didn’t know that he the first black president of the United States of America.

A. was to become B. becomes

C. is to become D. became

【答案】A

【解析】

試題分析：句意：在大學的時候，巴拉克·奧巴馬那里知道他將成為美國第一個黑人總統(tǒng)。用過去將來時表示過去某個時間將要發(fā)生的事情，所以選A。

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