Either John or his friends ________ to blame for the bad results.
A. are B. is C. was D. has been
出自:汉语言文学

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