题目内容

1．The new technology，if ________ to agriculture，will be a great help to increase the grain output．（　　）
A．applyingB．to applyC．appliedD．having applied

分析 这项新技术，如果被应用于农业，将对提高粮食产量有很大帮助．

解答 答案：C
此处用在if之后作条件状语，相当于if引导的条件状语从句；由于动词apply与其逻辑主语the new technology构成被动关系，故该从句应使用被动语态，即if the new technology is applied to agriculture；由于从句的主语与主句的主语一致，都是the new technology；并且从句的谓语动词中含有助动词be（is），因此此处可以省略主语the new technology 与助动词is，使用过去分词形式；故选C．

点评 做本题时，需要了解过去分词作条件状语，相当于if引导的条件状语从句的用法：如果状语从句的主语与主句的主语一致，而且状语从句的谓语中有助/系动词be，便可将状语从句中的主语连同be一同省略，用"连词+过去分词"作状语．

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