题目内容
18．-Do you know Mother's Day？-Certainly，it is popular and it ________ formally in the US in 1914．（ ）
| A． | celebrated | B． | was celebrated | C． | is celebrated | D． | was celebrating |
分析 ---你知道母亲节吗？
---当然知道，很流行，1914年在美国正式庆祝．
解答 答案：B．主语it是动词celebrate的承受者，故用被动语态，结合in 1914可知表达的是过去的事情，故用一般过去时的被动语态was/were+过去分词，主语it．故was，故答案是B．
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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