You will be late for school you hurry up.A. if B. since C. whenD. Unless

问题补充：

You will be late for school you hurry up.

A. if

B. since

C. when

D. Unless

答案：

A. if

B. since

C. when

(答案→)D. Unless

解析：A. 如果引导条件状语从句B.由于引导原因状语从句 C.当—时引导时间状语从句 D.如果不引导条件状语从句句意为：如果你不加紧点，上课就要迟到了

主句和从句为条件的制约关系。