-Is your sister at home, Dennis?                

-No, she isn't. I think she _     _ the piano in Anna's living room.               [ ]

A. can play        

B. could be playing  

C. had played        

D. plays

“多行不义必自毙”，洋枪队头目华尔就是一例。他被击毙是在[ ]

A．鸦片战争中

B．第二次鸦片战争中

C．太平天国运动中

D．义和团运动中