______ on his past mistakes, Ted realized that he had stayed around the wrong people.

A．To reflect

B．Reflecting

C．Reflected

D．Being reflected

下列各组物质，按单质、化合物、混合物顺序排列正确的是 [ ]

A．氮气、空气、干冰

B．液态氧、纯碱、碘酒

C．生石灰、熟石灰、石灰石

D．水银、石墨、盐酸