She said she returned the book to the library. I’m sure she________.

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问题 She said she returned the book to the library.  I’m sure she________.

选项 A、takes
B、is
C、was
D、did

答案D

解析 本题考查谓语动词的选择。根据题干“I’m sure she did.”我确定她还书了,“did”在这里代替的是“returned the book”,用助动词来代替动词。
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