Listen! Someone __________ at the door. I'll go to see who it is.
| A．has knocked |
| B．is knocking |
| C．are knocking |
| D．knocks |
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Listen! Someone __________ at the door. I'll go to see who it is.
| A．has knocked |
| B．is knocking |
| C．are knocking |
| D．knocks |
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