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【题目】You should look up the word in the dictionary when you are ___________ (sure) of its meaning.

【答案】unsure

【解析】

句意:如果不确定其含义,则应在字典中查找该单词。

考查形容词前缀,sure确定的,根据前面你应该在字典中查单词可知此处应该不确定其含义,故在sure前加否定前缀un表示不确定,故答案为unsure

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