专四

单选题Agriculture is the country's chief source of wealth, wheat __________ by far the biggest cereal crop.

A．is 
B．been 
C．be 
D．being

参考答案：D进入在线模考
【译文】农业是该国财富的主要来源，而小麦是其最重要的谷类作物。
【解析】独立主格结构。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，则构成独立主格结构，作句子的状语成分表示伴随状态。选项A．is和C．be为谓语动词，不可选，而选项B．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 the accident，most of them children．

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