问题描述：
At the moment she___with her brother at home
Amay play B must be playing C can play D must have
为什么A 不能,不是表猜测吗.谢谢好心人的回答
Amay play B must be playing C can play D must have
为什么A 不能,不是表猜测吗.谢谢好心人的回答
问题解答：
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