I really regret that. But our engineers are too busy __________ present.

选择一项:
a. at
b. after
c. with
出自:管理英语2

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