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题目来源 : 填空经典1500题
Select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning.

Psychologists have discovered that some of the most ______ advice on study habits is flat wrong, leading them to revise the guidelines they offer to students. 

popular
hallowed
respected
unassailable
effective
beneficial

Select two answer choices.

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