It was essential that these application forms __ back as early as possible.
A must be sent B will be sent C are sent D be 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