2. 外语
  3. Their efforts to improve the corn production have been very (effect)______.

Their efforts to improve the corn production have been very (effect)______.

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问题 Their efforts to improve the corn production have been very (effect)______.
选项
答案effective
解析 句意：他们为提高玉米产量而做出的努力非常有效。该题考查的是词性转换。作表语用形容词。
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