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you()wash these clothes because they are clean.A.needn't to B.don't need to

题目详情
you()wash these clothes because they are clean.A.needn't to B.don't need to
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答案和解析
选B
need作为实意动词,否定形式是:don't need to do
need作为情态动词,否定形式是:needn't do