(2013·高考天津卷)If he had spent more time practising speaking English before，he________ able to speak it much better now.

A．will be

B．would be

C．has been

D．would have been

YJl7卷烟机在生产过程中，可用卷烟机操作面板上的电位器手动校正钢印位置，若要使钢印位置向后移可将电位器逆时针转动。