这句话怎么办?其中which 可不可以用that 替代?Dr.Clark spent three y
这句话怎么办?其中which 可不可以用that 替代?Dr.Clark spent three y
发布时间:2021-02-28 02:15:47
这句话怎么办?其中which 可不可以用that 替代?Dr.Clark spent three years in the National Library during which time he collected most of the data he needed for his new book.