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16.--What are you reading,Tom?
--A letter _____ by my new e-pal from America.(  )
A.was sentB.sentC.has been sent

分析 ---汤姆,你在看什么?
---一封寄自我美国的新的网友的来信.

解答 答案:A.表达的是过去的事情用一般过去时,主语a letter 是动词send的承受者.故用一般过去时的被动语态was/were+过去分词,主语单数,故was,send的过去分词sent,故选A.

点评 被动语态由"助动词be+及物动词的过去分词"构成.被动语态的时态变化只改变be的形式,过去分词部分不变.疑问式和否定式的变化也如此.

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