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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大学英语三级B级

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