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

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

选项 A、is
B、been
C、be
D、being

答案D

解析 分析本句结构,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,加上它有自己的主语wheat,则构成独立主格结构,表示伴随状态。A项is和C项be为谓语动词,不可选;而B项been为过去分词,只见于独立结构中的被动形式,不合题意。请注意,此处being也可省略,“主语+名词”的结构也是独立主格的形式之一,如:Two hundred people died in theaccident,most of them children.
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