Tom _______ have kept his promise. I wonder why he changed his idea.

A、must
B、should
C、need
出自:国开作业公共政策概论

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