问题
选择题
单项选择。
You don't need ____ here every day. [ ]
A. come
B. to come
C. coming
D. came
答案
答案：B
搜题请搜索小程序“爱下问搜题”
单项选择。
You don't need ____ here every day. [ ]
A. come
B. to come
C. coming
D. came
答案：B
0=2.6300，当计算时刻的龄期t=17d时，则其徐变系数