分类：教育/科学-学习帮助
问题：高一英语4.You________suchalongcompos 
4. You ________ sh a long composition. The teacher only asked for 300 words. You have written 600.     A. mustn’t have written          B. couldn’t have   written     C. needn’t have written          D. do not have to write
回答：C
needn't have done本不必做某事，强调虽然做了，但是多此一举。