问题
选择题
—Do you know the boy under the tree?
—Yes, I know. He is creative and imaginative, but he is a little lazy _______. [ ]
A. once a time
B. at a time
C. at times
D. at time
答案
C
搜题请搜索小程序“爱下问搜题”
—Do you know the boy under the tree?
—Yes, I know. He is creative and imaginative, but he is a little lazy _______. [ ]
A. once a time
B. at a time
C. at times
D. at time
C
缺失，设计
作基牙，腭杆连接，可摘局部义齿修复。卡环和腭杆采用金合金分别铸造后，焊接起来