问题：
[单选题]
在下拉菜单里的各个操作命令项中，有一类被选中执行时会弹出子菜单，这类命令项的显示特点是（ ）。
A、命令项位于一条横线以上
B、命令项的右面标有省略号(…)
C、命令项本身以浅灰色显示
D、命令项的右面标有一个实心三角
参考答案：
D
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