The shipment was delayed because you had failed ( ) the necessary space.
A.book
B. to book
C.to order
D. order
出自:国家开放大学英语语法

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