People were afraid to leave their house, ______ the police had been ordered to stand by in case, of emergency, they were just as confused and helpless as anybody else.

A．and even if

B．but since

C．however after

D．for though

目的在于揭示资本周转速度及对剩余价值生产影响的是

A．资本循环

B．资本周转

C．资本流通

D．资本增殖