英语Jane spend three years in China,during which time she was learning ChineseJane spend three years in China,during which time she was learning Chinese.我就是搞不懂,为什么during which =when后还要加time,

Question

英语Jane spend three years in China,during which time she was learning Chinese
Jane spend three years in China,during which time she was learning Chinese.我就是搞不懂,为什么during which =when后还要加time,

Answer 1

那是在强调前面讲的在中国的三年时间.which time 在代替 前面讲过的 three years.
Jane spent three years in China.
Jane was learning Chinese during her three years in China.
用which time来连接上面要表达的俩句话.