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、being
C、been
D、be
答案B
解析 独立主格结构做主语补足语。
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