减压器是用来将气瓶中的高压气体降压后得到工作时所需的低压气体，并能保证工作时气体压力基本上稳定的装置。( )
参考答案：对
Wang Ling, one of my friends, is very good at English. He speaks English as if he ________ an Englishman.
A．were
B．would be
C．have been
D．had been
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