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 句子前后两部分存在逻辑上的并列关系，但因为并未用连接词and，所以后半句要用独立主格结构，即being。
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