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( 难度：中等)如何在 JavaScript 中添加注释
A.This is a comment
B.＜!--This is a comment--＞
C.//This is a comment
D./*This is a comment*/
A.This is a comment
B.＜!--This is a comment--＞
C.//This is a comment
D./*This is a comment*/
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