You’ll fail your next exam you start to work hard.A. becauseB. unlessC. soD. why

问题补充：

You’ll fail your next exam you start to work hard.

A. because

B. unless

C. so

D. why

答案：

A. because

(答案→)B. unless

C. so

D. why

解析：本题考查连词。unless表示让步。意思是“除非…”。句意：除非你开始努力，否则下次考试你会不及格。