西方国家税收发展的第四个时期是（）。
A、自由贡纳时期
B、税收承诺时期
C、专制课税时期
D、立宪课税时期
参考答案：D
Since she is out of work, Lucy________ going back to school, but she hasn’t decided yet.
A．had considered
B．has been considering
C．considered
D．is going to consider
如图所示，a图是测量______的仪表，图b所示的电表的示数为______V．
