Jack _____ yet, otherwise he would have telephoned me.

A．mustn’t have arrived

B．shouldn’t have arrived

C．can’t have arrived

D．needn’t have arrived

古代印度人发展农业生产的主要区域为 [     ]

A、恒河流域

B、印度河流域

C、恒河、印度河流域

D、沿海平原