Question

You won't feel happy at school      you get on well with your classmates.

A．though

B．when

C．unless

D．because

Answer 1

C

试题分析：句意:在学校里除非你和同学们相处的很好你才会感到幸福。though虽然，尽管，引导让步状语从句；when当……时候，引导时间状语从句；unless除非，如果不，引导条件状语从句；because 因为，引导原因状语从句。根据句意可知选C。