倒幕运动中，下级武士之所以能成为领导力量，主要是因为[ ]

A．资本主义经济发展不充分    

B．下级武士已经成为资产阶级    

C．封建专制统治异常稳定      

D．日本有尚武传统，武士有号召力

. You must do your homework now; you ______ computer games all the evening.

A．have been playing

B．play

C．are playing

D．played