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【题目】The robot has a speaker _______ a mouth.

A. for B. as C. on D. being

【答案】B

【解析】句意:这个机器人有一个扬声器当嘴。for为了,as作为;on……上;being是。结合句意,扬声器充当嘴的功能,故用介词as,故选B。

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