need在这道选择题中到底怎么选?
- Well,it's a pity I didn't buy that recently published dictionary yesterday.
- ____.I have already bout one for you.
A.You needn't buy it.
B.You needn't have bought it.
C.You didn't need to buy it.
D.You don't have to buy it.
A里面可以看作need做情态动词用,C里need做行为动词用,D用法也对,可是答案只有C是正确的,