---“Howdidtherobbergetin?”---“______anopenwindowonthefirstfloor.”A.Past

---“How did the robber get in?”
---“______ an open window on the first floor.”A.PastB.FromC.OverD.Through

D解析through 意为“穿过，贯穿，经过，透过”。又如：
The train ran through the tunnel. 火车穿过隧道。
I saw you through the window. 我是透过窗子看到你的。

我学会了