题目内容

Must we find out the reason today? - No, you _____.
A．mustn’tB．don’t haveC．don’t have toD．needn’t to
C
在英文中由must构成的一般疑问句，肯定回答通常用must，否定回答通常用needn’t
，或don’t have to，故本题只能选C。
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