there ------ a number of people in the park on sundays.

there ------ a number of people in the park on sundays.请问 这选什么 there ------ a number of people in the park on sundays.A is B are C will be D have选B为什么 不是 选A内 是 a number of people there ------ a map and some pictures on the desk.A are B is C have D has 选 b 但是 觉得 D 也可以呀 there has 请问怎么理解这题内