Science and technology have __________ in important ways to

Science and technology have __________ in important ways to the improvement of agricutural production.

A．attached

B．assisted

C．contributed

D．witnessed

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C

句意：科学技术在提高农产品的产量上作出了重要的贡献。attach …to 把… …附加在……上；assist帮助；contribute…to作贡献于；witness见证。故选C。

考点 ： 考查名词在语境中的应用辨析。

1年前

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