不同品牌的啤酒、服装一般来说属于（）行业。
A.完全竞争
B.不完全竞争
C.寡头垄断
D.完全垄断
参考答案：B
His mother _______ when he called just now. [ ]
A. is cooking
B. cooked
C. was cooking
D. would cook
自称“革命军中马前卒”`热情讴歌革命的资产阶级革命宣传家是（）
