Some of the students are not sure spelling the word, while others are not sure the use o

发布时间：2020-08-17 12:57:45

Some of the students are not sure      spelling the word, while others are not sure      the use of some grammatical rules.
A. of… about
B. about…to
C. of…to
D. for….of

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(答案→)A. of… about
B. about…to
C. of…to
D. for….of
解析：be sure of意思是：确信。be sure about意思是：对…有把握。
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