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(shí)，計(jì)算機(jī)是一個(gè)偉大的發(fā)明。invent 是一個(gè)動(dòng)詞，意思是發(fā)明；invitation 是一個(gè)名詞，意思是邀請(qǐng)；invention是一個(gè)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(shuō)計(jì)算機(jī)是一個(gè)偉大的發(fā)明，應(yīng)該用名詞。故選C。
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