18．-Do you know Mother's Day？
-Certainly，it is popular and it ________ formally in the US in 1914．（　　）
A．celebratedB．was celebratedC．is celebratedD．was celebrating

分析 ---你知道母親節(jié)嗎？
---當(dāng)然知道，很流行，1914年在美國正式慶祝．

解答 答案：B．主語it是動詞celebrate的承受者，故用被動語態(tài)，結(jié)合in 1914可知表達(dá)的是過去的事情，故用一般過去時的被動語態(tài)was/were+過去分詞，主語it．故was，故答案是B．

點評 被動語態(tài)由"助動詞be+及物動詞的過去分詞"構(gòu)成．被動語態(tài)的時態(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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