【題目】_____ will people have robots in their houses?

In about 100 years.

A. How far B. How long C. How often D. How soon

【答案】D

【解析】句意：——人類還要等多久在他們的家庭中擁有機器人？——大約100年之后。對“多久”提問用how soon。故選D。

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