A new notice should be put up to __________ the unwanted visitors __________.
| A．keep; in |
| B．keep; on |
| C．keep; up |
| D．keep; out |
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A new notice should be put up to __________ the unwanted visitors __________.
| A．keep; in |
| B．keep; on |
| C．keep; up |
| D．keep; out |
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