No one noticed that the little boy had ________ into the room and was sitting there, listening. ( 章节：1 难度：3)
- A、observed
- B、crawled
- C、choked
- D、crept
正确答案:D
答案解析:有
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No one noticed that the little boy had ________ into the room and was sitting there, listening. ( 章节：1 难度：3)
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