It isn't quite __________ whether the teacher will collect the homework by Friday, so you needn't hurry.
| A．sure |
| B．right |
| C．certain |
| D．exact |
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It isn't quite __________ whether the teacher will collect the homework by Friday, so you needn't hurry.
| A．sure |
| B．right |
| C．certain |
| D．exact |
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