We had a hard time the last time we went camping, because the fire ______ during the freezing night.

A．went over

B．went out

C．went on

D．went through

硬件系统保持稳定需要考虑（）

A.单点故障风险规避

B.备件支持保障

C.异构的硬件结构

D.所有系统的连续可用