It ________ ________ big arms.

【答案】doesn't have

【解析】

句意：它有大大的手臂。句子主语是第三人称单数, 谓语动词是实义动词, 变否定句用助动词doesn't, 谓语动词变成原形, 句子是: It doesn't have big arms. 故答案为: doesn't; have.