You ____ return the book now. You can keep it till next week if

You ____ return the book now. You can keep it till next week if you like.
A、can't
B、mustn't
C、needn't
D、may not
【正确答案】：C
【题目解析】：【考点点击】本题考查情态助动词。【要点透析】 needn'tt意为“不需要,不必”,强调客观条件,符合题意。cant意为“不能”; mustn''t意为“禁止”,语气强烈; may not意为“不可能”。