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