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had to be, ought to be, might have been; which, when, where
It is not known when ancient civilizations found out how to use the cacao's seeds. It____ by accident ____ the beans fell into a fire and roasted, releasing a chocolate-like smell.
had to be, ought to be, might have been; which, when, where
It is not known when ancient civilizations found out how to use the cacao's seeds. It____ by accident ____ the beans fell into a fire and roasted, releasing a chocolate-like smell.
might have been; when
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