At college.Barack Obama didn't know that he the first black president of the United States of America．( )A．was to becomeB．becomesC．is to becomeD．became 题目和参考答案——青夏教育精英家教网——

题目内容

12．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

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．

解答答案A．根据句意和语境可知，句中didn't know可知是过去发生的事情，排除B和C项，D项是过去时表示过去发生的动作，A项betodo过去将来时的一种结构，"was to do"表过去将要做某事，结合句意，A项符合语境，故选A．

点评本题考查时态的用法．解答此类题目的关键是要读懂句意，分析上下文的语境，判断时态，锁定答案．

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