该题有三种答案: 1、The kettle water has to be boiled for 3 minutes before it can be taken away for the stove. (这壶水需要在炉子上煮3分钟才可以拿下来。) 2、The kettle water had to be boiled for 3 minutes before it colud be taken away for the stove. (这壶水需要在炉子上煮3分钟才可以拿下来。) 3、The kettle water had been boiling for 3 minutes before it was taken away for the stove. (这壶水在炉子上沸了3分钟才被拿下来。)