1 the teacher do all the exercises,but a pupil__

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1 the teacher ____do all the exercises,but a pupil______
A needn't ,must B may not,must
C needn't ,needn't

1 The teacher ____do all the exercises,but a pupil______
A needn't ,must B may not,must
C needn't ,needn't
选择后请告诉我为什么选择这个答案
答：A
译：老师不必做所有的演习题,但学生必须做.
析：选对A没问题,只要翻译一下句意就可以知道A最佳.排除C也很容易.难的是如何说明B为什么不可以.
根据情态动词must和needn't的意思和句子的逻辑,but表示转斩,第二空一定是must.表示说话者的主观看法：学生必须做所有的这个练习.needn't 表示“不必”.那么may not可不可以呢?
其实 sb.may not do sth.有两种用法：1.表示推测,判断:如：He may not come this afternoon.他下午可能不来（也许不来）,2.表示“不允许”：You may not come in.你不可以进来.
这句中如用may not则只表示第一个意思：也许不做.,但后面的must do sth.只表示“义务”,不表示“推测”,如要表示推测,则应这么说：The teacher may not do all the exercises,but a pupile is sure to do all of them.

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