【多选题】
阅读下面的HTML代码，则下列选项中增加的样式可以使两个DIV不在同一行显示的有（????）style?type=text/css? div?{?float:right;?}?/style
?......? div?class=box1/div? div?class=box2/div
?......
①
.box2{clear:left;}
②
.box2{clear:both;}
③
.box1{clear:right;}
④
.box2{clear:right;}