问题
选择题
—Bob, you look so happy today!
—Well, I got ______ A on my English test. [ ]
A．the
B．a
C．an
D．/
答案
答案：C
搜题请搜索小程序“爱下问搜题”
—Bob, you look so happy today!
—Well, I got ______ A on my English test. [ ]
A．the
B．a
C．an
D．/
答案：C
平衡的调整，若前伸时，后牙无接触则可（）