使用非谓语动词的七大原则

正原则一:用作目的状语时,原则上要用不定式。1.When asked why he went there,he said he was sent there_____for a space flight.A.training B.being trained C.to have trained D.to be trained解析:由于进行航空飞行训练是他被派往那儿的目的,所以要用不定式,排除选项A和B。另外,由于"他"与"训练"为被动关系,所以选D。2._____this cake,you’ll need 2 eggs,175g sugar