问题
选择题
— How are you doing all these years, Jim?
— Nothing new. Everything is going on ____it was years ago. [ ]
A. as
B. while
C. when
D. since
答案
答案：A
搜题请搜索小程序“爱下问搜题”
— How are you doing all these years, Jim?
— Nothing new. Everything is going on ____it was years ago. [ ]
A. as
B. while
C. when
D. since
答案：A
则R→0时，下面说法正确的是（）。