题目内容：

we ()be in such a hurry since there is enough time
Acan't Bneed't Cmustn't Dmay not

优质解答

选B.
needn't 没必要,不必要.
因为后面说了时间充足,所以是没必要那么匆忙.用needn't.
can't 不能 ,mustn't 禁止,may not 不可能.都不符合题意