问题
选择题
—Alex's already gone back to Australia, _________?
—_________. He is on a visit to Shanghai.[ ]
A. isn't he; No
B. hasn't he; Yes
C. isn't he; Yes
D. hasn't he; No
答案
答案：D
搜题请搜索小程序“爱下问搜题”
—Alex's already gone back to Australia, _________?
—_________. He is on a visit to Shanghai.[ ]
A. isn't he; No
B. hasn't he; Yes
C. isn't he; Yes
D. hasn't he; No
答案：D
缺失，
Ⅱ度松动，其余天然牙健康，用
作基牙进行可摘局部义齿修复，基牙
上最好选用（）