【題目】A scientist and inventor (is /are) giving a speech.

【答案】is
【解析】句意:一位科學家和發(fā)明家正在發(fā)表演說。a scientist and inventor 指的是一個身兼兩職的人,是一個人,所以謂語動詞要用單數(shù)形式;如果是a scientist and an inventor就是一位科學家和一位發(fā)明家二個人,故選is。

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