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【题目】If you are _______ (sure) about anything, just ask. Remember, no doubt leads to nothing.

【答案】unsure

【解析】

句意:如果你对什么事情不确定,就问。要记得,没有疑问就没有结果。

根据句意要问,可知是如果对事情不确定,故sure确定的要加前缀un表示不确定的。故答案填unsure

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