You ______ such a long essay. Mr. Smith only asked for 300 words and you have written 900

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You ______ such a long essay. Mr. Smith only asked for 300 words, and you have written 900.

A.needn"t have written

B.needn"t write

C.didn"t need write

D.didn"t need to write

请帮忙给出正确答案和分析,谢谢!

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