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

試題分析：句意:在學校里除非你和同學們相處的很好你才會感到幸福。though雖然，盡管，引導讓步狀語從句；when當……時候，引導時間狀語從句；unless除非，如果不，引導條件狀語從句；because 因為，引導原因狀語從句。根據句意可知選C。