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 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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