【題目】There are many robots. They are working in the big factories. (合并為一句)
Theremany robotsin the big factories.

【答案】are;working
【解析】原句意:有許多機器人。他們在大工廠里工作。將兩句合并應該為有許多機器人在大工廠工作,there be后接表語,表示存在的事物,再接動詞ing形式修飾表語,所以答案是are,working。

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