【单选题】Stop here! I heard someone ________. [ ]
【简答题】A: I once heard someone shout, “Look out.” I put my heard out of the window and a bucketful water fell on me. It seems that “Look out” may mean “Don’t look out”. B: I was once on a ship and heard the ...
【单选题】I was almost asleep last night when I suddenly heard someone ______ at the door.
【单选题】Yesterday, when I went past the classroom, I _______ someone _______.
【单选题】What a shame for me when someone next to me heard a flute in the distance and I heard nothing .
【简答题】I was almost asleep last night when I suddenly heard someone _____at the door. A) be knocking B) knocking C) to knock D) having knocked
【单选题】无论13号车钩还是15号车钩,当车钩处于闭锁状态时,应()