15.Welcome to the Science Museum,everyone!This stone axe _______ in South Africa and experts can't be exactly sure about its use.(  )
A.had been foundB.was foundC.has been foundD.would be found

分析 歡迎大家來到科學(xué)博物館,這把石斧是在南非發(fā)現(xiàn)的,專家們不能確切地知道它的用途..

解答 答案是B.考查被動(dòng)語態(tài),this stone axe是句子的主語,與動(dòng)詞find之間是被動(dòng)關(guān)系"被發(fā)現(xiàn)",根據(jù)題干信息可知,石斧現(xiàn)在擺在博物館,發(fā)現(xiàn)應(yīng)該是過去時(shí),所以答案選B.

點(diǎn)評 被動(dòng)語態(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.掌握各種時(shí)態(tài)的被動(dòng)語態(tài)是解題的關(guān)鍵.

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