问题描述：
I'm sure he must ( )behind that tree.
0 - 离问题结束还有 14 天 23 小时
I'm sure he must ( )behind that tree.
0 - 解决时间：2009-9-13 23:02
A be hidden B be hidding C have hidden D have been hiding
0 - 离问题结束还有 14 天 23 小时
I'm sure he must ( )behind that tree.
0 - 解决时间：2009-9-13 23:02
A be hidden B be hidding C have hidden D have been hiding
问题解答：
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