2. 公务员
  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 that引导的宾语从句的谓语动词become发生在主句的谓语动词didn’t know的将来，即过去的将来，故that从句的谓语动词应该使用过去将来时。
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