四、巧借上下文1.All the preparations for the task ____, and we are ready to start.A.completed B.completeC.had been completed D.have been completed支招:通过文中we are ready to start“我们就要出发了”可推知“一切准备工作已经就绪”,表示完成,且依据时态一致原则,空白处须用现在完成时,故答案为D。2.She set out soon after dark ____ home an hour later.(NMET蒺94)A.arriving B.to arrive C.having arrived D.and arrived支招:set out“出发”和arrive home“回家”应为两个先后发生的“连贯”动作,此处应由and 连接两个并列谓语,所以答案选D。巧识下列句中上下文,然后准确选择时态:①Helen ____ her keys in the office, so she had to wait until her hus-band ____ home...