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【題目】At that time, the calculator was a great ______ / n'venn /.

A．invent B．invitation

C．invention D．inventor

【答案】C

【解析】

試題分析：句意：那時，計算器是一個偉大的發(fā)明。Invent動詞，發(fā)明；invitation邀請；invention名詞，發(fā)明；inventor發(fā)明家。根據音標可知該選C。

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