单项选择题
A．as poor, if not poorer than, his sister B．poor as his sister' s if not poorer C．as poor as, if not poorer than, his sister' s D．as poor, if not poorer than, his sister' s
A．has received B．ought to have received C．couldn't have received D．shouldn't have received
A．having known B．being known C．knowing D．known