Choose sentences which are correct.
A.How to operate this computer?
B.How do you to operate this computer?
C.I have lost my key.
E.
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