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    精英家教网 > 高中英语 > 题目详情
    Some of the students are not sure ___ spelling the word, while others are not sure ___ the use of some grammatical rules.
    A．of… aboutB．about…toC．of…toD．for….of
    A
    be sure of意思是：确信。be sure about意思是：对…有把握。
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