You needn't finish the work today.
A:don't have to
B:can't
C:mustn't
①利国利民 ②会加重国民负担 ③符合我国当前的国情 ④有利于建设美丽中国
一份稿件,甲单独用计算机录入要用8小时,乙单独用计算机录入要用10小时.