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 在这里wheat being by far the biggest cereal crop是独立主格结构，用来表示解释说明，再例如：Almost all the metals are good conductors，with silver being the best．几乎所有的金属都是好导体，银是最好的导体。
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