—Must I go there right now?
—No，you ________.You ________ go there before supper.
A．mustn't；needB．needn't；may
C．can't；needD．won't；can
B

Must I．..？肯定回答用Yes，you must.否定回答是No，you needn't或No，you don't have to，不能用mustn't，因?yàn)閙ustn't表示“不許；不準(zhǔn)；禁止”，本題后半部用may表示允許。
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