At that time, the calculator was a great ______ / ?n?ven?n /.
A.inventB.invitationC.inventionD.inventor
C

試題分析:句意:在那時,計算機是一個偉大的發(fā)明。invent 是一個動詞,意思是發(fā)明;invitation 是一個名詞,意思是邀請;invention是一個名詞,意思是發(fā)明;inventor發(fā)明者。根據(jù)句意和音標可知,這里是說計算機是一個偉大的發(fā)明,應該用名詞。故選C。
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