【多选题】下列样式代码中，可用于清除浮动的是：

A.float

B.position

C.clear

D.none

A.border:0

B.margin:0

C.padding:0

D.list-style:none

A.left

B.right

C.both

D.none

A.border:1px solid blue;

B.border-top:1px dashed blue;

C.border:1px dashed blue;

D.border-top:1px solid blue;

A..clearfloat{ clear:both;}

B..clearfloat{ clear:both;height:0;font-size:0; }

C..clearfloat{ float:left;}

D.clearfloat{clear:left;}

A.left

B.right

C.both

D.none

A.special{ position: absolute;}

B.special{ position: absolute; top:20px; left:16px;}

C.special{ position: relative;; top:20px; left:16px;}

D.special{ position: relative;}