【題目】They have sold a large number of air-conditioners since the temperature is high. (改為被動語態(tài))
A large number of air-conditioners have since the temperature is high.

【答案】been；sold
【解析】句意：因?yàn)闇囟冗@么高，他們已經(jīng)賣了大量的空調(diào)。本題要求改為被動語態(tài)，原句have sold是現(xiàn)在完成時(shí)態(tài)，變被動語態(tài)的時(shí)候，不能改變時(shí)態(tài)，現(xiàn)在完成時(shí)態(tài)的被動語態(tài)是have been +動詞的過去分詞，空前有了have，所以答案是been sold。

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