Much of the power of the trade unions has been lost.______, their political influence should very great..

A．As a result

B．As usual

C．Even so

D．So far

施工现场主干道宽度不宜小于（），载重汽车转弯半径不宜小于15m。

A、2.5m

B、4.5m

C、3.0m

D、3.5m