如果我们要探寻红军长征的足迹，可以选择的地点有
①遵义②瑞金③会宁④南昌[ ]
A．①②③④
B．①④
C．①②③
D．②③④
答案：C
Mary had to go to a meeting,so she left her children _________ at home. [ ]
A. playing
B. played
C. to play
D. having played
一小部分企业承担的平均存货都超过其基本需要。（）
