Search from various English teachers...
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Who would've thought that an electrical engineer would be the person to hold the key to unlock what was then one of the most complicated systems in the world
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What is the meaning of " what was then" in this sentence?
and why use "what"?
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Yes, I had been to australia for 2 months, traveling alone. It felt free when I traveled alone. Because I could travel the places where I wanted to without need to adopt someone else. I made a lot friend with people who from all over the world.
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