—I'm sad to hear that Yuan Longping passed away. —So am I. We lost a hero. His _____________ on hybrid (杂交) rice help

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1. (2021·东营) —I'm sad to hear that Yuan Longping passed away.
—So am I. We lost a hero. His _____________ on hybrid (杂交) rice helped Chinese people solve the problem of eating.

A . surveys B . reports C . researches D . achievements

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