you're joking! idiom
B1 （表示吃惊或不相信）你是在开玩笑吧！
something you say to show that you are surprised by what someone has said, or do not believe it is true
"Hey, Maria's leaving." "You're joking!" “嘿，玛丽亚要走了。”“你在开玩笑吧！”
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