finally came the day when he had to begin his study for the nest term.为什么用when
问题描述：
finally came the day when he had to begin his study for the nest term.为什么用when
答
为什么不用WHEN.
这句话主语是THE DAY 谓语是 CAME
WHEN 后面的都是修饰这个主语的.
如果正常的语序应是这样的,
The day when he had to begin his study for the next term came.