Theroom is cold.Who____(open)the window

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Theroom is cold.Who____(open)the window
Theroom is cold.Who____(open)the window

Theroom is cold.Who____(open)the window
opened
从句子可以看出窗户已经被打开了,是发生的过去的事情,所以用过去时.

opened

has opened, 强调过去发生的状态持续到现在,窗打开是状态!