The woman still doesn't know what __in her home while she was away.a/ happens b/happened c/ will happen d /was happened分析 、谢

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The woman still doesn't know what __in her home while she was away.a/ happens     b/happened     c/ will happen  d /was  happened分析 、谢

The woman still doesn't know what __in her home while she was away.a/ happens b/happened c/ will happen d /was happened分析 、谢
The woman still doesn't know what __in her home while she was away.
a/ happens b/happened c/ will happen d /was happened
分析 、

The woman still doesn't know what __in her home while she was away.a/ happens b/happened c/ will happen d /was happened分析 、谢
b
过去式,又因为不是被动的发生所以也不能选d

b
表示已发生