单选题 It's essential that people (be) (psychological) able to resist the impact (brought about) by the transition from (planned) economy to market economy.
【正确答案】 B
【答案解析】psychological改为psychologically。able是形容词，不可由形容词psychological修饰，须用其副词形式psychologically来修饰。有不少考生选A，他们认为be错了，其实在essential后的名词从句中，谓语动词应用(should)+动词原形。