2. 专升本
  3. At college, Barack Obama didn’ t know that he______the first black president of the United States of America.

At college, Barack Obama didn’ t know that he______the first black president of the United States of America.

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问题 At college, Barack Obama didn’ t know that he______the first black president of the United States of America.
选项 A、was to become
B、becomes
C、is to become
D、became
答案A
解析 根据语境，本处应表达“过去将来”，选项B、C、D均不符合；A项中不定式作表语代表事情未做，意为将来，结合was表达过去将来。故选A。
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