问道英语问题Agriculture is the country’s chief source of wealth, w

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问道英语问题
Agriculture is the country’s chief source of wealth, wheat ____ by far the biggest cereal crop.?
A.is B.been C.be D.being

选D,不是很清楚原因,麻烦大家释疑,谢谢

首先在做这种题目时,要明确出题的用意,这道题考你的是独立主格结构,因为前半句Agriculture is the country’s chief source of wealth 已经是个完整的句子,而后面又没有关联词,所以不可能再出现动词,排除A和C,而B没有这种用法,正确的独立主格表示完成时的结构应该是 having been,所以B错,不知道我是否已经说清楚了,有问题的话可以再消息我,

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