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

【答案】unsure

【解析】

句意:如果不確定其含義,則應(yīng)在字典中查找該單詞。

考查形容詞前綴,sure確定的,根據(jù)前面你應(yīng)該在字典中查單詞可知此處應(yīng)該不確定其含義,故在sure前加否定前綴un表示不確定,故答案為unsure。

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