what it is meaning?

来源：学生作业帮编辑：作业帮分类：综合作业时间：2024/10/04 14:10:12

what it is meaning?
这是英语四级听力题的开头说明部分：
You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the center.

你应该选择一个最佳的选项并在答题纸上划一条线标出相应的字母
大概是这样吧、、
a single line through the center..
四级不用2B铅笔涂的么.

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