【题目】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
在线课程【答案】A
【解析】试题分析：句意：在大学的时候，奥巴马不知道他将成为美国第一个黑人总统。用过去将来时表示过去某个时间将要发生的事情，所以选A。
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