外部帐号共21位1-3位为地区号4-9位为（）。
A.开户识别位
B.帐户标志码
C.帐户顺序号
D.校验位
参考答案：A
打开左转向灯开关，（如图所示）亮起。
Mike apologized for _______ to inform her of the change in the working plan.
A．his being not able
B．him not to be able
C．his not being able
D．him to be not able
