A. should have took B. should have been taken C. should be took D. should have been took 参考答案:B 答案解析:[分析] 测试点为“should+have+过去分词”的用法。这种结构表示对过去应做而实际上未做行为的批评。意为“早应该,本应”等。因本句的主语是 medicine,故句子结构为被动。如;Those
第7题: [单项选择]对心绞痛和高血压均有效的药物是 A. 普萘洛尔 B. 硝酸甘油 C. 肼苯哒嗪 D. 利血平 E. 卡托普利 参考答案:A