在我国古代，封建政府为了限制私营工商业的发展，征收[ ]

A．盐税和铁税      

B．关津之税和市肆之税

C．盐铁税和关津之税     

D．茶盐税和市肆之税

Roses need special care _____ they can live through winter.

A．because

B．so that

C．even if

D．as