摘要：28． at the door before enterning please． A．Knocked B．To knock C．Knocking D．Knock
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______ at the door before you enter my room, please.
| A．Knock | B．Knocking | C．Knocked | D．To knock |
______ at the door before you enter my room, please.
A．Knock B．Knocking C．Knocked D．To knock
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