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Fill in the blank with suitable conjunction.
I don't know _______ she left the house.
The blank begins a clause that tells us what the speaker does not know, so it must be introduced by a question word. "Why" fits naturally, giving "I don't know why she left the house", meaning the reason is unknown. "While" and "but" do not form a meaningful clause after "know", and "where she left the house" makes no sense.
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