这里must be连用表示猜测.你一定是在开玩笑吧?而单用must 则为必须的意思.所以必须有be 而must be 当表示现在的事情时要和动词的ing形式连用,有个"be"不是吗?:)
you must (be joking)
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You must be I could be wrong呢？