問題詳情

14. _______ at the back door, and they may hear you and open the door.
(A) Try knocking
(B) Trying to knock
(C) To try to knock
(D) To try knocking

參考答案

答案:A
難度:困難0.384615
統計:A(45),B(49),C(6),D(8),E(0)

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