After many months' experiments,they s____ last Monday.

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Aftermanymonths''experiments,theys____lastMonday.Aftermanymonths''experiments,theys____lastMonday.Afte

After many months' experiments,they s____ last Monday.
After many months' experiments,they s____ last Monday.

After many months' experiments,they s____ last Monday.
After many months' experiments,they succeeded last Monday.