The kids lay face down on the beach, their backs _________to the sun
A. exposing
B. exposed
C. having exposed
D. were exposing
出自:河南大学大学英语

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