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at the door before entering, please. 【查看更多】

 

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______ at the door before entering please.

A．Knocked B．KnockC．Knocking D．To knock

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______ at the door before entering please.

A．Knocked          B．Knock            C．Knocking          D．To knock

 

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_____ at the door before entering please.

A. Knocked 　 B. To knock　 C. Knocking 　 D. Knock

 

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______ at the door before entering please.


  1. A.
    Knocked
  2. B.
    Knock
  3. C.
    Knocking
  4. D.
    To knock

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________ at the door before entering, please.

A．Knocked

B．To knock

C．Knocking

D．Knock

 

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