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----- Have you heard of Earth Day ?
----Yes . The first Earth Day ______ in 1970 to educate us to protect our planet .
A.celebratesB.celebratedC.is celebratedD.was celebrated
D

试题分析:根据语境可知此句的含义是第一个地球日是在1970年举行的。考查的是被动语态的基本构成,因描述的是过去时故用一般过去时的被动语态,其基本构成就是was或were+动词的过去分词,主语是单数故用was,而celebrate的过去分词是celebrated故选D。
点评:被动语态表示主语是动作的承受者。被动语态是动词的一种特殊形式,一般说来,只有需要动作对象的及物动词才有被动语态。汉语往往用“被”、“受”、“给”等词来表示被动意义。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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