There is a ball in the box.(对划线部分提问 a下划线)

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There is a ball in the box.(对划线部分提问 a下划线)

There is a ball in the box.(对划线部分提问 a下划线)
There is a ball in the box.(对划线部分提问 a下划线)

There is a ball in the box.(对划线部分提问 a下划线)
How many balls are there in the box?
有多少个球在箱子里?