I really don't know whether_____(close) the windows.动词填空答案是to close 还是will close?为什么?

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I really don't know whether_____(close) the windows.动词填空答案是to close 还是will close?为什么?

I really don't know whether_____(close) the windows.动词填空答案是to close 还是will close?为什么?
I really don't know whether_____(close) the windows.
动词填空答案是to close 还是will close?为什么?

I really don't know whether_____(close) the windows.动词填空答案是to close 还是will close?为什么?
语法上来说是to close ,不然2个动词了