题目内容：
____________students are playing on the ground.选择一项：
A.
The number of
B.
A number of
C.
A number
参考答案：
选择题：____________students are playing on the ground.
- 题目分类：国家开放大学人文英语1
- 题目类型：选择题
- 查看权限：VIP
选择一项：
A.
The number of
B.
A number of
C.
A number