题目内容：
He is busy _____ his suitcase.
A．pack B．to pack
C．packing
D．packed
参考答案：
答案解析：
单选题：He is busy _____ his suitcase.
- 题目分类：英语
- 题目类型：单选题
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B．to pack
C．packing
D．packed
B．to pack
C．packing
D．packed
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