31. ______ at the door before you enter my room, please.(A) Knock (B) Knocking (C) Knocked (D) To kn

問題詳情

31. ______ at the door before you enter my room, please.
(A) Knock
(B) Knocking
(C) Knocked
(D) To knock

參考答案

答案：A
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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