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What has keys but can open no locks?

Retry Correct Incorrect Keys can refer to the metal implements we use to open locks, but can also refer to the components on a musical instrument. In this case, of course, we’re talking about the latter.

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Brock Wegner/Unsplash

Brock Wegner/Unsplash

What has keys but can open no locks?

• A children’s toy
• A doorknob
• A car
• A piano