How pleased the detective was _____ what his customer told him!
A. hearing
B. heard
C. to hearing
D. to hear
出自:国家开放大学英语语法

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块