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It was really a pity that he worked late yesterday or else h

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It was really a pity that he worked late yesterday or else he ---our party.
A,must have joined B,wouldn't have joined C,should have joined D,needn't have joined,请解释各项,
It was really a pity that he worked late yesterday or else h
A的意思是“一定已经.”,B用于虚拟语气,表示对过去事情的假设,意思是“本来会做”.C.的意思是"本应该做."但事实上没有做D.的意思是“本不需要做”但事实上做了
再问: 为什么不选C?