Work hard at your lessons you’ll fail the exams again.A. andB. butC. orD. which

问题补充：

Work hard at your lessons, you’ll fail the exams again.

A. and

B. but

C. or

D. which

答案：

A. and

B. but

(答案→)C. or

D. which

解析：考查固定句型：祈使句+and/or+简单句，句意：努力学习，否则你又会不及格了。选C。