You won’t lose weight______you keep a diet and take exercises every day.
A．becauseB．unlessC．ifD．but
B

試題分析：because因為；unless除非，如果不；if是否，如果不；but但是。句意：如果你每天不保持飲食和參加鍛煉，你就不能減肥。結合語境可知選B。
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