五四运动后期斗争的地点和主力分别是[ ]
A．北京、工人
B．北京、学生
C．上海、学生
D．上海、工人
答案：D
—Robert is indeed a wise man.
—Oh, yes. How often I have regretted his advice![ ]
A. to take
B. taking
C. not to take
D. not taking
______是组成查询准则的基本元素。
