Great changes have taken place in that school. It’s no longer ___ it was 20 years ago, ____ it was so poor.

A．what, when

B．that, which

C．what, which

D．which, that

张华同学以八折的优惠价格购买了一件物品，节省了10元，那么他买这件物品实际用了（　　）

A．30元

B．40元

C．50元

D．75元