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单选题
若插图有修订，则所修订内容对面左边空白处会有一条黑色竖线。
A
There will be a black vertical line on the other side of the left margin where there is a annotation to an illustration.
B
When an illustration is revised, there is a black vertical line on the other left side of the revision.
C
In the case of a revision to an illustration, a black vertical line will appear in the left margin opposite the revision.
答案解析
正确答案：C
