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Health experts
up to 18 people for possible exposure to Ebola（埃博拉）, Five students
after coming into contact with the patient, Dallas officials said．
A．observed; are monitoring
B．observed; have been monitored
C．have observed; were monitoring
D．were observing; were being monitored
答案
：D
试题分析：句意：达拉斯官员说：健康专家正在观察18名可能接触到埃博拉病毒的人，在接触病人以后，五名学生正在被监视。根据动词said可知本句叙述的是过去正在发生的事情 ，所以都使用过去进行时。故D正确。
考点：考查时态
2015届江苏无锡普通高中高三上期中英语试卷（带解析）