You must be kidding if you think I can finish this in one day.

如果你认为我能在一天内完成这个，你一定是在开玩笑。

Mr. yang, you must be kidding!

杨先生， 你肯定在开玩笑！

You must be kidding,on the moon?

你一定在开玩笑，在月球上？

B: Oh！You must be kidding,on the moon?

噢!你一定在开玩笑，在月球上？

You must be kidding. It's too dangerous.

你一定在说笑。那太危险了。

You must be kidding! Anyway do you have a girlfriend?

你肯定在开玩笑吧！你有女朋友吗？

You must be kidding. Are you thinking of moving there?

你在开玩笑吧？你是打算跳槽吗？

A: You must be kidding! It is Chinese New Year, silly!

A: 你在开什么玩笑啊！我是说春节，你这傻瓜！

Molly: You must be kidding? I am fed up with your poor work habits.

莫莉: 你一定是在开玩笑吧? 我受够了你差劲儿的工作习惯.

Molly : You must be kidding? I am fed up with your poor work habits.

莫莉：你一定是在开玩笑吧？我受够了你差劲儿的工作习惯。