John was so sleepy that he could not keep his eyes ____.
A、open
B、opened
C、to open
D、opening
出自:南京工程学院教育英语

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