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题目
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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

答案
A
解析
be sure of意思是:确信。be sure about意思是:对…有把握。
核心考点
试题【Some of the students are not sure ___ spelling the word, while others are not su】;主要考察你对介词和介词短语等知识点的理解。[详细]
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