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    The new technology, if       to rice growing, will help increase the grain output．

    A．applying B．applied C．to apply D．having applied

    B

    解析试题分析：句意：如果被应用于水稻种植，这个新科技将帮助增加谷类的产量。这里是if条件句的省略式，完整的是If the new technology is applied to rice growing，如果主从句的主语一致的时候，可以省略从句的主语和be动词，所以选B。
    考点：考查状语从句的省略

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