问题
选择题
— I hear Daming has gone to Hainan Island for his holiday.
— Oh, how nice! Do you know when he ? [ ]
A．was leaving
B．had left
C．has left
D．left
答案
答案：D
搜题请搜索小程序“爱下问搜题”
— I hear Daming has gone to Hainan Island for his holiday.
— Oh, how nice! Do you know when he ? [ ]
A．was leaving
B．had left
C．has left
D．left
答案：D
＝0.5m，竖直半圆轨道NP、TQ直径