第6题: [单项选择]There ______ little change in the patient's condition since he was taken to the hospital. A. is B. has been C. have been D. was 参考答案:B 答案解析:[考查点] 动词时态
[句意] 自从入院以来,那个病人的状况就一直没多大变化。
[解析] 现在完成时可以表示持续,即过去时间发生的动作,一直持续到现在,常和since,for连用。
第13题: [单项选择]{{I}}Questions 14-17 are based on the following dialogue{{/I}}What are the students doing when the man arrives in class A. Taking an exam. B. Drawing graphs. C. Giving reports. D. Having a class discussion. 参考答案:C