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