Vivian refuses ______ her children to the weekend training centre for extra classes.
A:to send
B:sending
C:sent
D:sends
反比例函数y=k+3x的图象在二、四象限,则k的取值范围是( )
某品牌自行车进价是每辆800元,标价是每辆1200元,店庆期间,商场为了答谢顾客,进行打折促销活动,但是要保证利润不低于5%,则最多可打( )折.