苦楝皮常用以治疗的病证是（）。

A.蛔虫证

B.蛲虫证

C.钩虫证

D.绦虫证

E.疥癣湿疮

Much of the power of the trade unions has been lost ____, their political influence should be very great.[ ]

A. As a result

B. As usual

C. Even so

D. So far