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(biāo)可知，這里是說計算機是一個偉大的發(fā)明，應(yīng)該用名詞。故選C。
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