题目内容
--- Must I see the dentist at once？
--- No, you .
A. mustn’t B. can’t C. needn’t
C
解析试题分析：句意：—我必须立刻去看牙医吗？—不，你不必。以must开头的一般疑问句，否定回答要用needn’t，所以此题选C。
考点：考查情态动词的用法
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