2. 外语
  3. Agriculture is the country’s chief source of wealth, wheat______by far the biggest cereal crop.

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 非限定动词题。分析句子结构可知，本句需要一个非谓语动词结构在句子中作状语，故[D]正确。
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