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3.The scientist and engineerhas(have) invented a new machine.

分析 这名科学家兼工程师发明了一种新的机器.

解答 答案是has.本题考查语境中选用所给词的恰当形式;题干中主语是由and连接的并列名词表示"科学家兼工程师",指一个人,故答案是has.注意,如果指代两个人,第二个名词前要有冠词.

点评 本题是要求用所给动词的适当形式填空,解题时首先考虑句中需要的是谓语动词还是非谓语动词;其次,如果是谓语动词关注时态、语态和数的变化;如果是非谓语动词要联系非谓语的基本用法判断非谓语的形式.

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