Overall, the question of treatment was Aunlikely to be settled quickly. There was no doubt Bthat some stones, especially sapphir

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问题 Overall, the question of treatment was Aunlikely to be settled quickly. There was no doubt Bthat some stones, especially sapphires Cfrom Montana, Dwere permanent improved by heating.

选项 A、 
B、 
C、 
D、 

答案D

解析 选项D中,修饰动词improved应当用副词,因此把permanent改为permanently(持久地;永远地)。
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