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______ at the door before entering please.
| A．Knocked | B．Knock | C．Knocking | D．To knock |
______ at the door before entering please.
A．Knocked B．Knock C．Knocking D．To knock
_____ at the door before entering please.
A. Knocked B. To knock C. Knocking D. Knock
A．Knocked
B．To knock
C．Knocking
D．Knock
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