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  -ing分词用法题。题意:“农业是该国的主要财富来源,小麦至今仍是种植最多的谷类植物。”-ing分词分句在这里为独立结构,作状语。
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