改写Unless you start at once,you’ll be late.
问题描述：
改写Unless you start at once,you’ll be late.
答
Start at once, or you'll be late.
Start at once, otherwise you'll be late.
答
Start at once, or (否则) you’ll be late.
答
if you don`t start at once,you’ll be late.
答
Start immediately or be late.