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

分析 ---湯姆，你在看什么？
---一封寄自我美國(guó)的新的網(wǎng)友的來信．

解答 答案：A．表達(dá)的是過去的事情用一般過去時(shí)，主語a letter 是動(dòng)詞send的承受者．故用一般過去時(shí)的被動(dòng)語態(tài)was/were+過去分詞，主語單數(shù)，故was，send的過去分詞sent，故選A．

點(diǎn)評(píng) 被動(dòng)語態(tài)由"助動(dòng)詞be+及物動(dòng)詞的過去分詞"構(gòu)成．被動(dòng)語態(tài)的時(shí)態(tài)變化只改變be的形式，過去分詞部分不變．疑問式和否定式的變化也如此．

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