---Must I be back home before 6 o’clock?
---No, you ____. But don’t be too late.
A．can’tB．mustn’tC．needn’tD．won’t
C
must構(gòu)成的一般疑問句，否定回答是沒這個必要，用needn’t或don’t have to，故
本題選C。
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