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?
理由?请问是虚拟语气么?
![You must have made a mistake when you _______ the bill _____](/uploads/image/z/7022527-7-7.jpg?t=You+must+have+made+a+mistake+when+you+_______+the+bill+_____)
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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