問題詳情

【題組】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)