用四妙勇安汤治疗血栓闭塞性脉管炎，其证型是（）。
A.寒湿阻络
B.血瘀气滞
C.湿热毒盛
D.气血两虚
E.肝肾阴虚
参考答案：C
滴铅法如何进行？
If we ________ the other road, we might have arrived here in time for the meeting.
A．had taken
B．take
C．took
D．have taken
