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12．Do you know that tea by Shengnong many years ago．（　　）

A．

invented

B．

is invented

C．

was invented

分析你知道茶是神農許多年前發明的嗎？

解答答案：C．
主語 tea是動詞invite的承受者，表達的是 many years ago所發生的事情，所以時態應該用一般過去式的被動語態：was/were+過去分詞，tea為不可數名詞，所以be動詞應該用was，故選C．

點評被動語態由"助動詞be+及物動詞的過去分詞"構成．被動語態的時態變化只改變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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