(2013·重庆部分学校高三联考)At the edge of the grass，there's a sign saying“ the grass”．
A. Keep up
B. Keep away
C. Keep off
D. Keep back
网友回答
A. Keep up
B. Keep away
(答案→)C. Keep off
D. Keep back
解析：考查动词短语辨析。句意：草地边缘有一块牌子，上面写着“勿践踏草地”。keep off表示“使……不接近，远离……”，符合语意。A项表示“保持，跟上”；如果选择B项，要在后面加上from，keep away from表示“远离”；D项表示“隐瞒，阻止”。