PIN2是（），用户不用理会PIN2，即使PIN2锁住，也不会影响正常通话。

A.跟资料修改有关；

B.跟网络有关；

C.跟网络的计费和SIM卡内部资料修改有关；

D.跟计费有关。

Only when he reached the tea-house ______ it was the same place he’d been in last year.

A．he realized

B．he did realize

C．realized he

D．did he realize