No one noticed that the little boy had ________ into the room and was sitting there, listening. ( 章节：1 难度：3)_做题室

单项选择题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：
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