— The lady starred in many films.

— Really? But rarely _____________in public nowadays.

A．she is seen

B．is she seen

C．was she seen

D．she was seen

现有X、Y、Z三种金属，将X和Y分别投入到稀硫酸中，Y表面产生气泡，X无明显现象；若将Y和Z分别投硫酸铜溶液中，在Y和Z表面均有红色物质出现，则三种金属的化学性质最活泼的是[ ]

A．X

B．Y

C．Z

D．无法判断