【归纳拓展】 have no alternative but to do sth.别无选择；只好做某事 an alternative to...……的替代品 alternatively adv.可供选择地 have no choice but to do sth. 别无选择只好做…… can't do nothing but do 只好做某事

【即时巩固】 ①He had no alternative but ________ (obey) the rule. ②I had no choice but ________ (wait) where I was. 【答案】①to obey　②to wait