It was essential that the applications forms __ back before the deadline.
A must be sent B would be sent C be sent D were sent
出自:统招专升本-----英语

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