问题
选择题
—Must I go there right now?
—No，you ________.You ________ go there before supper.
A．mustn't；need
B．needn't；may
C．can't；need
D．won't；can
答案
答案：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，因为mustn't表示“不许；不准；禁止”，本题后半部用may表示允许。