Tom looks so pale today. He ______ ill.

A. must be   
B. had to be   
C. should be   
D. shall be
出自:英语2(本)

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