问题描述：
1. Water boils at 100度 ，at which temperature it changes to gas.请问此处的it 指什么不能去掉吗？ 2.she is the one of the girls who have passed the examination.为什么one前加the? 如果去掉the.还是用have吗
1. Water boils at 100度 ，at which temperature it changes to gas.请问此处的it 指什么不能去掉吗？ 2.she is the one of the girls who have passed the examination.为什么one前加the? 如果去掉the.还是用have吗
1. Water boils at 100度 ，at which temperature it changes to gas.请问此处的it 指什么不能去掉吗？ 2.she is the one of the girls who have passed the examination.为什么one前加the? 如果去掉the.还是用have吗
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