2. 外语
  3. His theory turned out to be very (effect) ______ to improve our experiment.

His theory turned out to be very (effect) ______ to improve our experiment.

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问题 His theory turned out to be very (effect) ______ to improve our experiment.
选项
答案effective
解析 effect翻译为“效果”，是名词。此外需变成形容词作be的表语，与前面的be一起构成系表结构。
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