这个wit为什么不可以用wits？

He asked his students to use their brains because he thought her speech has wit.

wit做智慧（intelligence）讲时,是不可数的。She had to use all her native wit to convince the police。 wit做智力（ability to think quickly ）讲时,是可数的,常用复数。 She couldn't seem to gather her wits and tell us what had happened。 wit也可以表示智慧之语（clever use of words ）,可数的 a book full of the wit and wisdom of his 30 years in po...全部

  wit做智慧（intelligence）讲时,是不可数的。She had to use all her native wit to convince the police。 wit做智力（ability to think quickly ）讲时,是可数的,常用复数。
   She couldn't seem to gather her wits and tell us what had happened。 wit也可以表示智慧之语（clever use of words ）,可数的 a book full of the wit and wisdom of his 30 years in politics wit还可以表示智者,才子,那肯定是可数的。
   在你这个句子中，wit是当做智慧来用的，所以是不可数。收起