John began to get _____ about the machine since it didn.t work well.

A、worried
B、surprised
C、excited
出自:行车设备维修施工管理规定

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