29.( )Do you know who_________ at the door?(A) knock (B) is knocking (C) should knocking(D) you are

問題詳情

29.( )Do you know who_________ at the door?
(A) knock
(B) is knocking
(C) should knocking
(D) you are knocking

參考答案

答案：B
難度：計算中-1
書單：沒有書單，新增

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