Agriculture is the country’s chief source of wealth, rice ______. by far the biggest cereal crop.

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问题 Agriculture is the country’s chief source of wealth, rice ______. by far the biggest cereal crop.

选项 A、is
B、been
C、be
D、being

答案D

解析考查独立主格结构。由于逗号不能连接两个完整的句子，因而逗号后所接部分只能是非谓语形式，即独立主格结构作句子的状语。rice与be之间为主动关系，因此用现在分词being。选项A和C为句子谓语，可先排除；而选择B为过去分词，表被动形式，不合题意。

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专业英语四级

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