You will fail your next exam you start to work hard at your study now.A. becauseB. unless

问题补充：

You will fail your next exam you start to work hard at your study now.

A. because

B. unless

C. so

D. if

答案：

A. because

(答案→)B. unless

C. so

D. if

解析：考查连词的用法。句意：你下次考试会不及格的，除非你现在开始努力学习。所以选unless 除非。