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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