We were watching TV when suddenly there was a ____ on the window.

问题描述:

We were watching TV when suddenly there was a ____ on the window.
A. tip
B. tap
C. lap
D. sap
选什么,为什么呢?

B 我们正在看电视的时候突然听到敲打窗户的声音
tip 倾斜、小费
lap 衣服下摆
sap 坑道