—Have they got their new house painted yet?

—I don't know. But I was told it ________ when I met them last week.

A．had been painting

B．would be painting

C．was painted

D．was being painted

下列说法正确的是（　　）

A．升高温度，固体物质的溶解度一定增大

B．溶液都是均一、稳定的混合物

C．稀溶液一定是不饱和溶液

D．一定温度下，36g某固体物质溶解于100g水中，则该物质的溶解度为36