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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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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