You’ll fail your next exam you work hard at your lessons from now on .A. or B. so C. unl

问题补充：

You’ll fail your next exam you work hard at your lessons from now on .

A. or B. so C. unless

答案：

解析：句意：如果从现在开始你不努力学习功课，下次考试你会失败的。A. or 或者；B. so 所以；C. unless如果不。故选C。