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China is a "big wild card" for oil as the lifting of COVID curbs sends cases soaring, Dan Yergin said. Nobody knows how bad the impact of so many infections will be on the economy, the energy expert said. A slowdown in the world's second-biggest economy would pull down demand and prices for crude oil.China is "one big wild card on the upside that hangs over the oil market," energy expert Daniel Yergin has said, as the country lifts its strict zero-COVID...