改错:He said that he will do his work the day after tomorrow.(只有一处错)

问题描述:

改错:He said that he will do his work the day after tomorrow.(只有一处错)
其中:"that"是A、"will"是B、"his"是C、"the day after tomorrow"是D.
提问:哪一处错了,并改正?

B will改为would