問題詳情

18. Try ____________ the door to see if someone is in the room.
(A) to knocking
(B) knocking
(C) to knock
(D) and knocked

參考答案

答案:C[無官方正解]
難度:適中0.5
統計:A(0),B(1),C(5),D(0),E(0)

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