—So you gave Mary your dictionary?
— ______.She said she'd return it to me when she could afford her own.
A:Not exactly.
B:My pleasure.
C:No doubt.
D:Good idea.
宋代,有田产的“主户”只占民户总数20%左右,其余大都是四处租种土地的“客户”。导致这种状况的重要因素是( )