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--- Any news about the fire?
--- Nearly 20 people ______ from the burning building by now.
A.rescuedB.have been rescuedC.have rescuedD.were rescued
B

试题分析:考查时态:句意:--有火灾的消息吗?--早现在为止,近20人已经从燃烧的大楼中被救出了。和by now连用用现在完成时。还有people和rescue是被动关系,用现在完成时的被动。选B。
点评:英语中的时态主要由动词的形式决定,因此在学习英语时态时,要注意分析动词形式及具体语境,想象在那个特定的时间动作所发生的背景,这个动作是经常性动作、一般性动作、进行性动作、完成性动作还是将要发生的动作。这题关键是by now这个词组是明显的暗示。
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