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With the rise of modern communication tools, handwritten letters ______ by emails. 
A.will replace B.have replacedC.are replacedD.are being replaced
D

试题分析:考查时态:句意:随着现代通讯工具的增加,手写信正被电子邮件代替。handwritten letters和replace是被动关系,而且这个动作是现在正在发生。用现在进行时的被动式。选D。
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。考查时态的时候别忘了语态问题。
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