Scientists have done a lot of study to show that praise is far______ (effective)

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问题 Scientists have done a lot of study to show that praise is far______ (effective) than criticism in improving students’ behavior.

选项

答案 more effective

解析从结构上看，than暗示题中要用比较级，effective为多音节词，故其比较级形式为more+多音节词。

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