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【题目】They have sold a large number of air-conditioners since the temperature is high. (改为被动语态)
A large number of air-conditioners have since the temperature is high.

【答案】been;sold
【解析】句意:因为温度这么高,他们已经卖了大量的空调。本题要求改为被动语态,原句have sold是现在完成时态,变被动语态的时候,不能改变时态,现在完成时态的被动语态是have been +动词的过去分词,空前有了have,所以答案是been sold。

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