His suggestions turned out to be very (effect) ______ in the improvement of our

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问题 His suggestions turned out to be very (effect) ______ in the improvement of our production.

选项

答案 effective

解析此题中的空格前是一个be动词加上一个副词，因此空格中填入形容词是最合适的。effective为形容词意为“有效的”，另外，turn out to be后面可接形容词或名词，意为“结果是……，被证明是……”。

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