The children cheered up when they saw hundreds of colorful balloons（）slowly io the sky.
考试：MBA考试
科目：英语（在线考试）
问题：
A：floating
B：raising
C：heaving
D：ascending
答案：
解析：
相关标签：
The children cheered up when they saw hundreds of colorful balloons（）slowly io the sky.
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