问一个有关英语语法的问题

Question

The kettle water ____(boil) for 3 minites before it ____(take) away from the stove.

请问这两个空该怎么填， 知道的朋友帮忙解答， 并讲解， 谢谢

Answer 1

had been boiling
was taken
因为有"before"
所以前一个空表示在水被从炉子上拿走之前，这三分钟水一直在被煮，是过去完成时的进行语态。
而且过去完成时表示的事过去的动作的再前面一个动作。既然后一个空用了"was taken"，那就要因该用过去完成时。

Answer 2

had been boiling was taken
这壶水在炉子上煮了三分钟才拿下来

Answer 3

the kettle water boiled for 3 minutes before it had taken away from the stove.

Answer 4

had boiled, was taken.本回答被提问者采纳