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 名词独立主格用法题。题意：“农业是这个国家的主要财富来源，而小麦则是最主要的谷物。”此处应用动名词形式，故选D。
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