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

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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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Theireffortstoimprovethecornproductionhavebeenvery(effect)______.effec