在接待工作中陪同客人乘电梯，如电梯有人服务，应（）。
A.客人先进先出
B.客人先进后出
C.客人后进先出
D.客人后进后出
参考答案：A
-May I speak to Mr. White?
-Sorry, he __________ Beijing, but he __________ in three days.[ ]
A. has been in; will come back
B. has been to; won't be back
C. has gone to; will come back
D. has gone to; would be back
双轨制在这种体制下，（）是新闻单位的最高行政首长。
