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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

 

D

【解析】

試題分析:句意:達拉斯官員說: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,五名學生正在被監視。根據動詞said可知本句敘述的是過去正在發生的事情 ,所以都使用過去進行時。故D正確。

考點:考查時態

 

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