You won’t lose weightyou keep a diet and take exercises every day.A. becauseB. unlessC. if

问题补充：

You won’t lose weightyou keep a diet and take exercises every day.

A. because

B. unless

C. if

D. but

答案：

A. because

(答案→)B. unless

C. if

D. but

解析：because因为；unless除非，如果不；if是否，如果不；but但是。句意：如果你每天不保持饮食和参加锻炼，你就不能减肥。结合语境可知选B。