Agriculture is the country’s chief source of wealth, wheat ______ by far the big

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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

解析本题考查的是非谓语动词的用法，根据句意，因此正确答案是D。

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