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

十七大报告进一步指出，深化政治体制改革要坚持党总揽全局，（ ）的领导核心作用。

A．民主执政

B．有效治理国家

C．.依法行政

D．协调各方