【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】句意：在大學的時候，奧巴馬不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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