I’m putting on weight. The doctor has warned me to sugar.
A. keep up
B. keep back
C. keep off
D. keep away
网友回答
A. keep up
B. keep back
(答案→)C. keep off
D. keep away
解析： keep off有“不接近、避免”等意思，在此题中是“不(吃、喝)”之意，又如：keep off cigarettes /drink /fatty food不抽烟/不喝洒/不吃油腻食物。keep up“不低落、维持”；keep back“阻止、不将某物给某人、隐瞒”；keep away“不靠近”。