----- 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

試題分析：根據(jù)語(yǔ)境可知此句的含義是第一個(gè)地球日是在1970年舉行的�？疾榈氖潜粍�(dòng)語(yǔ)態(tài)的基本構(gòu)成，因描述的是過去時(shí)故用一般過去時(shí)的被動(dòng)語(yǔ)態(tài)，其基本構(gòu)成就是was或were+動(dòng)詞的過去分詞，主語(yǔ)是單數(shù)故用was，而celebrate的過去分詞是celebrated故選D。
點(diǎn)評(píng)：被動(dòng)語(yǔ)態(tài)表示主語(yǔ)是動(dòng)作的承受者。被動(dòng)語(yǔ)態(tài)是動(dòng)詞的一種特殊形式，一般說來，只有需要?jiǎng)幼鲗?duì)象的及物動(dòng)詞才有被動(dòng)語(yǔ)態(tài)。漢語(yǔ)往往用“被”、“受”、“給”等詞來表示被動(dòng)意義。被動(dòng)語(yǔ)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(yǔ)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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