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

 

D

【解析】

試題分析：句意：達(dá)拉斯官員說：健康專家正在觀察18名可能接觸到埃博拉病毒的人，在接觸病人以后，五名學(xué)生正在被監(jiān)視。根據(jù)動詞said可知本句敘述的是過去正在發(fā)生的事情 ，所以都使用過去進(jìn)行時(shí)。故D正確。

考點(diǎn)：考查時(shí)態(tài)

 

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