问题描述：
[单选]
（英英释义）In the case of a revision to an illustration，a black vertical line or a black hand may be utilized to call attention to the changed portion．
A．In the case that a revision to an illustration happens,a black vertical line or a black hand neec not be used to focus on the changed part.
B．If an illustration is to be revised,you may use a black vertical line or a black hand to draw attention to the modified part.
C．A black vertical line or a black hand ought not to be utilized to revise the illustration and draw attention to the changed part.
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