问题补充:
单选题Isupportedhimintime,otherwisehe______offthebike.A.might fallB.would fallC.should have fallenD.would have fallen
答案:
D解析otherwise 否则,相当于if not。本句可改为: if I hadn’t supported him in time, he ___off the bike。显然,这是与过去事实相反,主句应用would/could…+have done。故选D。