Agriculture is the country’s chief source of wealth, wheat______ by far the bigg

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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

解析句子前后两部分存在逻辑上的并列关系，但因为并未用连接词and，所以后半句要用独立主格结构，即being。

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