改错：Youneedhavestudiedthatlatelastnight.Itwasharmfultoyo...

问题详情：

改错：You need have studied that late last night. It was harmful to your health.

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【回答】

need→needn't　由后面的句子可知，前一句句意为“昨天晚上你不必学到那么晚”，因此应用need的否定形式。needn't have done “本不必做某事(而实际上做了)”。

知识点：虚拟语气

题型：短文改错