You must have made a mistake when you ___ the bill _

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You must have made a mistake when you _______ the bill ________. added…up为什么这么填?用过去时态
理由?请问是虚拟语气么?

这是混合虚拟语气,即复合句中从句和主句只有一个是虚拟语气,这里是主句虚拟（you must have made a mistake）must have done 是虚拟语气的惯用结构,指对过去事情的猜测,而从句when you added the bill up.是过去的事实,所以用一般过去时.翻译为你可能是在加清单的时候弄错了

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