You ____ him so closely; you should have kept your distance.
A. shouldn.t follow
B. mustn.t follow
C. couldn.t have been following
D. shouldn.t have been following
出自:乐山师范学院英语语法

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