Halloween is believed to be a day _____ all the spirits come back to the world of the living, and we have

the same day in China called "Guijie", the Day of Dead.[ ]

A. where          

B. when            

C. which          

D. that

( )这一合同广泛用于一般性计划和可行性研究、设计、详细设计和施工、技术援助等监理(咨询)活动。

A．人月合同

B．总付合同

C．百分比合同

D．成本加固定酬金合同