Choose the word that best completes the sentence.Hint: Determine the connotation (positive or negative) through context clues.Although the problem was difficult to resolve, Sandra and John were （）in searching for an answer.Their teacher was quite proud.

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A.persistent

B.stubborn

C.bullheaded

D.headstrong

正确答案：persistent

Tag：通用学术交流英语时间：2022-03-07 20:27:00

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