— That's a great sweater. I have never seen anything like it before.

— You think so? My grandmother ______ it for me.[ ]

A. makes

B. made

C. has made

D. had made

生活中一些食品或用品的近似pH如下表，以下说法正确的是 

A．牙膏是酸性物质

B．胃酸过多的人不宜吃泡菜

C．草木灰可以降低土壤碱性

D．食醋能使石蕊试液变蓝