—How long have you been here?
—___ the end of last year.
A.Since
B.At
C.By
D.In
答案:A
You ____ finish the work today, for you still have three days left. [ ]
A. won't
B. mustn't
C. can't
D. needn't
更新维护资料中强调了线路发生变更后应在()天内提交更新的维护资料。
A、1
B、3
C、5
D、7