机械薄膜泵:danxiangxuanze

来源:百度文库 编辑:查人人中国名人网 时间:2024/04/28 16:52:16
1.Mr Smith has been in Beijing for ____.
A.a year and half
B.year and a half
C.year half
D.a year and a half

D 史密斯夫人在北京已经有一年半了

D.a year and a half

D