The meeting was just getting to the heart of the matter ( ) it's time to knock off.

A. while
B. when
C. until
D. after

以下关于中国联通双模双待的几种说法，不正确的是（）

A.同时可以有2个号码在线

B.同一时间只能有一个号码在线

C.手机可以识别来电来自的网络

D.手机无法自动识别来电是来自哪个网